Complex sentence: In 1896 Mauser changed the firing pin distance facilitating faster lock time and accuracy; he also installed a cutout section in the left of the receiver, perfect for a thumb to fill while loading the ammunition from a charger/stripper clip.
Split into simpler sentences: In 1896 Mauser changed the firing pin distance facilitating faster lock time and accuracy. Installed a cutout section in the left of the receiver perfect for a thumb to fill while loading the ammo from a charger/stripper clip.