Complex sentence: To accomplish this, the player pilots one of the three available Mark 2.1 AWAT (All-Weather All-Terrain) combat aircraft and are charged with defending the last three Allied airbases being evacuated in front of the enemy's advance.
Split into simpler sentences: To accomplish this, the player pilots one of the three available Mark 2.1 AWAT (All-Weather All-Terrain) combat aircraft. They have to defend while the last three Allied airbases are being evacuated in front of the enemy's advance.