Complex sentence: Of all the factions, the Scrin possess the most powerful aerial force, consisting of fighters, bombers, and carriers and a Mothership, which has a powerful Catalyst Cannon that can devastate adjacent structures beneath it by initiating a chain reaction upon them.
Split into simpler sentences: Of all the factions, the Scrin possess the most powerful aerial force, consisting of fighters, warships, and carriers. Their aerial fleet can even deploy a unit known as the "Mothership", which has a powerful Catalyst Cannon that can devastate adjacent structures beneath it by initiating a chain reaction upon them.