Complex sentence: Park Ward was a British coachbuilder founded by William M. Park and Charles W. Ward in 1919 who had worked together at F.W. Berwick Ltd., the makers of Sizaire-Berwick cars.
Split into simpler sentences: Park Ward was a British coachbuilder founded by William M. Park and Charles W. Ward in 1919. They had worked together at F.W. Berwick Ltd., the makers of Sizaire-Berwick cars.