Complex sentence: Although ambitious and greedy, Otho did not have a record for tyranny or cruelty and was expected to be a fair emperor; however, trouble in the form of Vitellius was marching down on Italy from Germany.
Split into simpler sentences: Although ambitious and greedy, Otho did not have a record for tyranny or cruelty and was expected to be a fair emperor. However, trouble in the form of Vitellius was marching down on Italy from Germany.