Complex sentence: Harrison was forced to call off his plans for a winter campaign to retake Detroit, and it was held by the British until a United States victory at the Battle of Lake Erie on September 10,1813 allowed the recapture of Detroit.
Split into simpler sentences: Harrison was forced to call off his plans for a winter campaign to retake Detroit. The city was held by the British until a United States victory at the Battle of Lake Erie on September 10,1813 allowed the recapture of Detroit.