Complex sentence: She met a poorer student named Justin Belson, who got her into a group of drug users, namely his ex-girlfriend, Molly Hecht, her best friend, Jan Brown, and her boyfriend, Jay Benson.
Split into simpler sentences: She met a poorer student named Justin Belson, who got her into a group of drug doers. Namely his ex-girlfriend, Molly Hecht; her best friend, Jan Brown and her boyfriend, Jay Benson.