Complex sentence: Once Jenner and series producer Norris had finalised the subject matter and music genre, lyrics were commissioned from the writing team, usually Dave Cohen, and rewritten as needed under Norris' supervision to ensure as much factual information as possible was included.
Split into simpler sentences: Once Jenner and series producer Norris had finalised the subject matter and music genre, lyrics were commissioned from the writing team, usually Dave Cohen. These were rewritten as needed under Norris' supervision to ensure as much factual information as possible was included.