Complex sentence: In this context, the TACP is a USAF unit that is collocated with Army combat maneuver echelons from the corps to the battalion and provides its aligned Army unit with expertise in planning and executing airpower in support of the land component commander's scheme of maneuver.
Split into simpler sentences: In this context, the TACP is a USAF liaison element aligned with Army combat maneuver echelons from corps to battalion. The TACP provides its aligned Army unit with expertise in planning and executing airpower in support of the land component commander's scheme of maneuver.