Complex sentence: However, Liang Ji was hesitant to yield authority to an able emperor, and, because Marquess Zhi was betrothed to his sister and relatively young, he felt that he could control him, and so insisted on making him emperor.
Split into simpler sentences: However, Liang Ji was hesitant to yield authority to an able emperor. Because Marquess Zhi was betrothed to his sister and relatively young, Liang Ji felt that he could control him and insisted on making him emperor.