Complex sentence: Saco offered an "enhanced" M60E3 with product improved parts and FN offered its M240 coaxial gun with a buttstock, bipod, and other infantry features; as such, both weapons were upgrade kits of weapons already in service.
Split into simpler sentences: Saco offered an "enhanced" M60E3 with product improved parts and FN offered its M240 coaxial gun with a buttstock, bipod, and other infantry features. As such, both weapons were upgrade kits of weapons already in service.