Complex sentence: First issued in 1943, the M1 uses a simple blowback operation, the charging handle was moved to the side, and the flip-up adjustable Lyman rear sight was replaced with a fixed L sight.
Split into simpler sentences: First issued in 1943, the M1 uses a simple blowback operation, with the charging handle moved to the side. The flip-up adjustable Lyman rear sight was replaced with a fixed L sight.