Complex sentence: The walker can show surprising flexibility with good pilots, and when combined with its great firepower, it is anything but defenseless against snowspeeders, even though the AT-AT lacks any rear or top mounted weapons for anti-air defence.
Split into simpler sentences: The walker can show surprising flexibility with good pilots, and when combined with its great firepower, it is anything but defenseless against snowspeeders. This is even though the AT-AT lacks any rear or top mounted weapons for anti-air defence.