Complex sentence: He decided to leave Florida for a large city, and, considering Chicago and New York City too big, followed his friend Gossie McKee to Seattle in March 1948, knowing that the biggest radio hits came from northern cities.
Split into simpler sentences: He decided to leave Florida for a large city, but considered Chicago and New York City too big. Charles followed his friend Gossie McKee to Seattle in March 1948, knowing the biggest radio hits came from northern cities.