Complex sentence: A new more modern four seat model appeared in 1901 with twin cylinder engine made by Buchet and was the first to carry the Belsize name as the "Marshall Belsize" and in 1903 the company name was changed to Belsize Motors and Engineering.
Split into simpler sentences: A new more modern four seat model appeared in 1901 with twin cylinder engine made by Buchet and was the first to carry the Belsize name as the "Marshall Belsize". In 1903 the company name was changed to Belsize Motors and Engineering.