Here’s an example of ‘some of’ modifying the relative pronoun ‘which’:
I have many connections, some of which are less than reputable.
In the English Grammar Profile, C1 point 98 in the category of PRONOUNS / quantity is defined as:
‘some of’, ‘many of’ to modify relative pronouns in a relative clause.
A search on iWeb for ngrams of some|many of _**q _v is listed below.
1 SOME OF WHICH ARE 17696
2 MANY OF WHICH ARE 17353
3 MANY OF WHOM ARE 7936
4 MANY OF WHICH HAVE 5146
5 SOME OF WHICH HAVE 4964
6 MANY OF WHOM HAVE 4832
Since the war, the orphanage has had to take in not only babies but also older children,
many of whom have witnessed terrible events as well as being separated from their families.
7 SOME OF WHICH WERE 4491
8 MANY OF WHOM WERE 4063
9 MANY OF WHICH WERE 3928
10 SOME OF WHICH MAY 3524
11 SOME OF WHOM ARE 2745
12 SOME OF WHICH CAN 2438
13 SOME OF WHOM HAVE 2209
14 SOME OF WHOM WERE 2070
15 SOME OF WHICH WILL 1882
16 SOME OF WHICH IS 1741
17 MANY OF WHOM HAD 1710
18 SOME OF WHICH INCLUDE 1633
19 MANY OF WHICH CAN 1456
20 SOME OF WHOM HAD 1071
21 MANY OF WHICH WILL 1049
22 MANY OF WHOM WILL 841
23 SOME OF WHICH HAD 803
24 SOME OF WHOM MAY 751
25 SOME OF WHICH WAS 729
26 SOME OF WHICH COULD 688
27 SOME OF WHICH MIGHT 636
28 MANY OF WHICH HAD 592
29 SOME OF WHAT IS 572
30 SOME OF WHICH WOULD 513
31 MANY OF WHICH MAY 469
32 MANY OF WHOM DO 458
33 SOME OF WHICH DO 442
34 SOME OF WHICH HAS 433
35 SOME OF WHOM WILL 431
36 MANY OF WHOM WOULD 427
37 MANY OF WHICH DO 424
38 MANY OF WHOM LIVE 394
39 MANY OF WHICH INCLUDE 372
40 MANY OF WHOM MAY 366
41 MANY OF WHICH WOULD 364
42 SOME OF WHICH DATE 358
43 SOME OF WHAT WAS 358
44 MANY OF WHICH OFFER 347
45 MANY OF WHICH COME 287
46 SOME OF WHICH REQUIRE 276
47 MANY OF WHOM COME 268
48 MANY OF WHICH CONTAIN 254
49 MANY OF WHICH COULD 252
50 MANY OF WHOM WORK 228
51 SOME OF WHICH CONTAIN 211
52 MANY OF WHICH INVOLVE 209
53 MANY OF WHICH REQUIRE 198
54 SOME OF WHICH INCLUDED 197
55 SOME OF WHOM MIGHT 193
56 SOME OF WHICH APPEAR 191
57 SOME OF WHAT HAS 185
58 MANY OF WHOM CAME 184
59 MANY OF WHOM DID 180
60 SOME OF WHICH COME 176
61 MANY OF WHICH REMAIN 173
62 SOME OF WHOM WOULD 161
63 SOME OF WHICH OFFER 156
64 MANY OF WHO ARE 154
65 SOME OF WHICH SEEM 152
66 MANY OF WHICH FEATURE 149
Lifehacker Australia67 SOME OF WHICH INVOLVE 145
68 SOME OF WHICH DID 141
69 MANY OF WHOM WENT 140
70 MANY OF WHOM CAN 135
71 SOME OF WHOM DO 134
72 SOME OF WHICH GO 134
73 MANY OF WHICH APPEAR 132
74 MANY OF WHICH PROVIDE 132
75 SOME OF WHOM DID 131
76 SOME OF WHAT MAKES 131
77 MANY OF WHICH SEEM 130
78 SOME OF WHAT HAPPENED 128
79 MANY OF WHICH CAME 127
80 MANY OF WHOM WORKED 125
81 SOME OF WHICH CAME 119
82 MANY OF WHOM COULD 118
83 MANY OF WHICH USE 111
84 SOME OF WHICH REMAIN 107
85 SOME OF WHICH LOOK 106
86 MANY OF WHO HAVE 99
87 MANY OF WHICH MAKE 98
88 MANY OF WHICH TAKE 98
89 SOME OF WHICH INVOLVED 97
90 SOME OF WHICH SHOULD 96
91 MANY OF WHOM SUFFER 94
92 SOME OF WHICH USE 92
93 MANY OF WHOM BECAME 92
94 MANY OF WHOM DIED 92
95 MANY OF WHOM MIGHT 91
96 MANY OF WHICH DATE 89
97 SOME OF WHO ARE 89
98 SOME OF WHOM COULD 89
99 SOME OF WHICH MAKE 88
B2 vocabulary: feature, suffer