Complex sentence: Three other controls--the dimensional stabiliser, vector tracker, and the handbrake--were also identified, but although the stabiliser had been mentioned before in the series, the canonicity of the mini-episode is also unclear.
Split into simpler sentences: Three other controls--the dimensional stabiliser, vector tracker, and the handbrake--were also identified. Although the stabiliser had been mentioned before in the series, the canonicity of the mini-episode is also unclear.