Complex sentence: BMH started using legacy jigs and tools to produce complete bodyshells for historic models in 1988, with its MG MGB replacement body, the car had been out of production for 8 years.
Split into simpler sentences: BMH started using legacy jigs and tools to produce complete bodyshells for historic models in 1988. It began production with its MG MGB replacement body, after the car had been out of production for 8 years.