Complex sentence: Experience had shown it was best to have two composite squadrons, one squadron with fighters and the by now obsolete Fairey Swordfish equipped with Air to Surface Vessel radar (ASV) for night patrols.
Split into simpler sentences: Experience had shown it was best to have two composite squadrons. One squadron included fighters and the by now obsolete Fairey Swordfish equipped with air-to-surface vessel (ASV) radar for night patrols.