Complex sentence: Swallow Sidecar Company, Swallow Sidecar and Coachbuilding Company, and Swallow Coachbuilding Company before 1930 when a limited liability company was incorporated to own their business.
Split into simpler sentences: Swallow Sidecar Company, Swallow Sidecar and Coachbuilding Company, and Swallow Coachbuilding Company. In 1930 a limited liability company was incorporated to own their business.