Complex sentence: Probably advised by Zhang in this, Liu employed Hán Xin, also a member of Hán royalty (not to be confused with Liu Bang's general of the exact same name), the new Prince of Hán and sent him to attack Zheng Chang.
Split into simpler sentences: Probably advised by Zhang in this, Liu employed Hán Xin (not to be confused with Liu Bang's general of the exact same name), also a member of Hán royalty. The new Prince of Hán and sent him to attack Zheng Chang.