Complex sentence: The headquarters and manufacturing facilities of the Duesenberg Automobiles and Motors Company were relocated from Newark, New Jersey, to Indianapolis, Indiana during this time, but the move was completed in May 1921, and the redesign was not.
Split into simpler sentences: The headquarters and manufacturing facilities of the Duesenberg Automobiles and Motors Company were relocated from Newark, New Jersey, to Indianapolis, Indiana during this time. The move was completed in May 1921, but the redesign was not.