Complex sentence: In 1920, he married the actress Sybil Seely, who played in five films directed by Buster Keaton and bore him a son in 1921 and retired from acting in 1922.
Split into simpler sentences: In 1920, he married the actress Sybil Seely, who played in five films directed by Buster Keaton. She bore Furthman a son in 1921 and retired from acting in 1922.