Complex sentence: Conscious of her unpopularity she banished, and afterwards put to death, three Gothic nobles whom she suspected of intriguing against her rule, and at the same time opened negotiations with the emperor Justinian I with the view of removing herself and the Gothic treasure to Constantinople.
Split into simpler sentences: Conscious of her unpopularity she banished--and afterwards put to death--three Gothic nobles whom she suspected of conspiring against her rule. At the same time, she opened negotiations with the Byzantine Emperor Justinian I with the view of removing herself and the Gothic treasure to Constantinople.