Complex sentence: Lee was one of the favourite actors of Tim Burton, and became a regular in many of Burton's films, working for the director five times, starting in 1999, where he had a small role as the Burgomaster in the film "Sleepy Hollow".
Split into simpler sentences: Lee was one of the favourite actors of Tim Burton and became a regular in many of Burton's films, working for the director five times since 1999. He had a small role as the Burgomaster in the film "Sleepy Hollow".