Complex sentence: However, he still had a violent streak, as evidenced in his first act as Don--with Michael's tacit blessing, he ordered the deaths of Gilday, Keinszig and Lucchesi in one mass slaughter.
Split into simpler sentences: However, he still had a violent streak, as evidenced in his first act as Don. With Michael's tacit blessing, he ordered the deaths of Gilday, Keinszig and Lucchesi in one mass slaughter.