+-------MVx--------+
| +-----Xd-----+
| | +---MF---+-------Xc------+
+--Dmc-+--Spx--+---Pa--+ | | +_IDN+---Jp--+ |
| | | | | | | | | |
Many people.p were.v injured.a , some of them children.n /////
This unusual construction requires a special arrangement. It involves a noun-phrase surrounded by commas, consisting of a phrase like "many [/some/five/several] of them" followed by a noun phrase. In our handling of this construction, "of_them" is an idiomatic expression which serves as the head of the phrase.