Complex sentence: In Wufei's story it is revealed that Wufei's home colony had a Tallgesse unit (Although how they obtained it is unknown) that was piloted by Wufei's wife Meilan to defend their home colony from a biological weapon attack.
Split into simpler sentences: In Wufei's story it is revealed that Wufei's home colony had a Tallgeese unit of their own, but how they obtained it is unknown. It was piloted by Wufei's wife Meilan in an attempt to defend their home colony from a biological weapon attack.