Complex sentence: Wong immediately continued with the project once "In The Mood For Love" was complete, reportedly becoming obsessed with it, and Bettinson writes that it "became a behemoth, impossible to finish".
Split into simpler sentences: Wong immediately continued with the project once "In The Mood For Love" was complete, reportedly becoming obsessed with it. In Bettinson's account, it "became a behemoth, impossible to finish".