Complex sentence: In 1916, General Motors opened a major automobile factory in East Oakland called Oakland Assembly, making Chevrolet cars and then GMC trucks until 1963, when it was moved to Fremont in southern Alameda County.
Split into simpler sentences: In 1916, General Motors opened a major automobile factory in East Oakland called Oakland Assembly. It produced Chevrolet cars and then GMC trucks until 1963, when it was moved to Fremont in southern Alameda County.