Complex sentence: The company was formed in Maidenhead by brothers Ron and Arthur Hacker in 1959, and traded successfully until 1977, when financial difficulties resulted in the company being sold and relaunched with the name Hacker Sound, but this venture closed in 1979.
Split into simpler sentences: The company was formed in Maidenhead by brothers Ron and Arthur Hacker in 1959, and traded successfully until 1977. Financial difficulties resulted in the company being sold and relaunched with the name Hacker Sound which closed in 1979.