Complex sentence: After Danny Baldwin's ownership of the factory until 2007, Paul Connor co-owned underworld with Adam Barlow, after a short while however sold his 40% to Liam Connor, Paul's brother.
Split into simpler sentences: After Danny Baldwin's ownership of the factory until 2007, Paul Connor co-owned Underworld with Adam Barlow. After a short while, he sold his 40% to Liam Connor, Paul's brother.