Complex sentence: Qin Er Shi 秦二世 (died 207 BC), literally "Second Emperor of Qin Dynasty", whose name is Ying Huhai 嬴胡亥 was the beloved second son of Qin Shi Huangdi, but he was not the official heir.
Split into simpler sentences: Qin Er Shi 秦二世 (died 207 BC), literally "Second Emperor of Qin Dynasty", whose name is Ying Huhai 嬴胡亥. He was the beloved second son of Qin Shi Huangdi, but he was not the official heir.