Complex sentence: The Winkler Studio became known as the Mintz Studio after he took over in 1929, and in 1939, a few months before his death in 1940, Screen Gems after Columbia Pictures took over from him.
Split into simpler sentences: The Winkler Studio became known as the Mintz Studio after he took over in 1929. In 1939, a few months before his death, Screen Gems after Columbia Pictures took over from him.