Complex sentence: Green already had a track record in the UK co-operative movement: as well as her status as a Labour and Co-operative MEP, she had been a Woodcraft Folk leader and worked as Assistant Parliamentary Secretary for the Co-operative Union (1986-1989).
Split into simpler sentences: Green already had a track record in the UK co-operative movement. She had been a Woodcraft Folk leader and worked as Assistant Parliamentary Secretary for the Co-operative Union (1986-1989).