Complex sentence: The first Kel-Lites were made in San Dimas, California; then the company moved to Covina, California as demand increased, and on to Barstow, California to a larger facility with a full service machine shop, plating and assembly line.
Split into simpler sentences: The first Kel-Lites were made in San Dimas, California. Then the company moved to Covina, California as demand increased, and on to Barstow, California to a larger facility with a full service machine shop, plating and assembly line.