Complex sentence: In 1545, Nguyen Kim was assassinated by a supporter of the Mac. Nguyen Kim had two young sons (Nguyen Hoang and Nguyen Uong) but it was Trinh Khiem who took control of the Royal army.
Split into simpler sentences: In 1545, Nguyễn Kim was assassinated by a supporter of the Mạc. Nguyễn Kim had two young sons (Nguyễn Hoàng and Nguyen Uong) but it was Trịnh Khiem who took control of the Royal army.