Complex sentence: After first building the Moya typewriter, he set up the Imperial Typewriter Company in Leicester in the UK they stopped manufacturing typewriters when personal computers are becoming popular and people stoped buying typewriters they manufactured typewriters in Leicester from start of the company to the end.
Split into simpler sentences: After first building the Moya typewriter, he set up the Imperial Typewriter Company in Leicester in the UK they ceased manufacturing typewriters when personal computers became popular and people stopped buying typewriters. They manufactured typewriters in Leicester from start of the company to the end.