Complex sentence: Shortly after manufacturing moved from PFI in the U.S. to J. P. Sauer In Germany, the safety was redesigned and moved from the receiver to the bolt, and the bolt was changed from a smooth to a fluted surface.
Split into simpler sentences: Shortly after manufacturing moved from PFI in the U.S. to J. P. Sauer In Germany, the safety was redesigned and moved from the receiver to the bolt. Also, the bolt was changed from a smooth to a fluted surface.