Complex sentence: The king sent him to prison and had him brought to Como; in 939 he escaped from Como into Provence, becoming a tutor in a noble family until he returned to the Abbey of Lobbes in 944.
Split into simpler sentences: The king sent him to prison and had him brought to Como. In 939 he escaped from Como into Provence, where he was a tutor in a noble family until he returned to the Abbey of Lobbes in 944.