Complex sentence: Established in late 1942 as a P-47 Thunderbolt fighter squadron, trained under I Fighter Command in the mid-Atlantic states, the 159th also flew air-defense missions as part of the Philadelphia Fighter Wing.
Split into simpler sentences: Established in late 1942 as a P-47 Thunderbolt fighter squadron, it trained under I Fighter Command in the mid-Atlantic states. The 159th also flew air-defense missions as part of the Philadelphia Fighter Wing.