Complex sentence: He was one of the highest paid stars of his time; making $5,000 a week in 1915, and $2 million a year through his own production company during the 1920s.
Split into simpler sentences: He was one of the highest paid stars of his time. He earned $5,000 a week in 1915, and $2 million a year through his own production company during the 1920s.