Complex sentence: The first model was produced in 1921 and was a large pen, 5.5 inches long when capped, and made of a showy bright red hard rubber and expensively priced at $7.00,.
Split into simpler sentences: The first model was produced in 1921 and was a large pen--5.5 inches long when capped. It was made of a showy bright red hard rubber and expensively priced at $7.00,.