Complex sentence: In 1940 the television company Paramount, in an attempt to strengthen their business, took control of fellow rivals DuMont after failed attempts to work with other established companies in their field, including CBS, RCA and AT&T.
Split into simpler sentences: In 1940 the television company Paramount, in an attempt to strengthen their business, took control of fellow rivals DuMont. After failed attempts to work with other established companies in their field, including CBS, RCA and AT&T.