Complex sentence: The Great Khali debuted in WWE alongside Daivari and had alliances with Ranjin Singh and Jinder Mahal, but spent most of his career as a singles wrestler and in 2007 he became WWE's World Heavyweight Champion.
Split into simpler sentences: The Great Khali debuted in WWE alongside Daivari and had alliances with Ranjin Singh and Jinder Mahal. However, Khali spent most of his career as a singles wrestler and in 2007 he became WWE's World Heavyweight Champion.