Complex sentence: Three paratroopers fired on the aggressors with their H&K assault rifles, joined by a non-commissioned officer with his 9mm pistol and by turret-mounted 7.62mm machine guns.
Split into simpler sentences: Three paratroopers fired on the aggressors with their H&K assault rifles, followed by a non-commissioned officer with his 9mm pistol. They were joined by turret-mounted 7.62mm machine guns.