Complex sentence: BYD Auto Co Ltd was born a year after the 2002 acquisition of Tsinchuan Automobile Co Ltd. Mobile phone components were added to BYD's product line around the same time, but this business, BYD Electronic, was spun-off in 2007.
Split into simpler sentences: BYD Auto Co Ltd was born a year after the 2002 acquisition of Tsinchuan Automobile Co Ltd, and mobile phone components were added to its product line around the same time. But the mobile phone business, BYD Electronic, was spun-off in 2007.