Complex sentence: The Pakistan Naval Air Arm, (or, unofficially, Pakistan Naval Aviation), is the naval aviation branch of the Pakistan Navy which is tasked to carry out air surveillance, limited aerial warfare, and reconnaissance operations.
Split into simpler sentences: The Pakistan Naval Air Arm (unofficially "Pakistan Naval Aviation") is the naval aviation branch of the Pakistan Navy. The Naval Air Arm is tasked to carry out air surveillance, limited aerial warfare, and reconnaissance operations.