Complex sentence: The only version available to the public was the LM4 which was first designed and manufactured in the U.S.A. in the early 1980s and marketed at a price of US $750.
Split into simpler sentences: The only version available to the public was the LM4. The LM4 was first designed and manufactured in the U.S.A. in early the 1980s and marketed at a price of US $750.