Complex sentence: Season 3 takes place at a boarding school instead of at Webster High School held by a big technology company, Z Tech, ran by Zoltan Grundy (Dominic Burgess).
Split into simpler sentences: Season 3 takes place at a boarding school instead of at Webster High School. The school is run by a big technology company, Z Tech, owned by Zoltan Grundy (Dominic Burgess).