Complex sentence: The Alfa was the first vehicle that Pininfarina produced in large numbers, in fact Alfa Romeo chose Pininfarina to produce the Spider in large part because they felt confident that they could produce 20 cars a day for a run of 1,000 bodies.
Split into simpler sentences: The Alfa was the first vehicle that Pininfarina produced in large numbers. In fact Alfa Romeo chose Pininfarina to produce the Spider in large part because they felt confident that they could produce 20 cars a day for a run of 1,000 bodies.