Complex sentence: In 1923, Dodson's became The Vectis Bus Company, and in 1929, the company was bought by Southern Railway, and became The Southern Vectis Omnibus Company Limited.
Split into simpler sentences: In 1923, Dodson's became The Vectis Bus Company. In 1929, the company was bought by Southern Railway, and became The Southern Vectis Omnibus Company Limited.