Cap 28
Section 20
…nam discipulos docebat, quorum magna turba eum sequebatur…
No macros - using mobile.
I can’t figure out that quorum. To whom/what does it refer?
quōrum refers to discipulōs and is a partitive genitive.
“Of which a great many…”?
So he had a lot of disciples, many of which followed him (as a group).
I think I’d better read it again 
Paul.
nam discipulōs docēbat, quōrum magna turba eum sequēbātur
“for he taught pupils, of which a great crowd followed him”
