Many are the + NOUN + RELATIVE CLAUSE

Point 117 in PRONOUNS/quantity is defined as:

complex noun phrases using an inverted form ‘Many’ + ‘are’ + noun phrase, followed by a relative clause, as a focusing device.


FOR EXAMPLE:

  NBC News
Covid is having a devastating impact on children — and the vaccine won’t fix everything
and many are the children of immigrants who don’t speak English.
15 Dec 2020

*We can’t find any meaningful data in corpora for this rare grammar structure.