Complex sentence: He began his career in local disco dance competitions (dancing NORTHERN SOUL style) in the North of Scotland and made an appearance in the Nationally Televised 1979 UK disco dance finals and was a dancer for the Wigan Casino, whilst collecting Northern Soul records.
Split into simpler sentences: He began his career in local disco dance competitions (dancing in the "northern soul style") in the North of Scotland, and made an appearance in the nationally televised 1979 UK disco dance finals. He was also a dancer for the Wigan Casino, whilst collecting Northern Soul records.