Complex sentence: After the match, Higgins punched an official in the stomach at the post-match press conference; this, alongside a threat to have Dennis Taylor shot at the 1990 World Cup a month earlier, led to Higgins being banned for the entire 1990/1991 season.
Split into simpler sentences: After the match, Higgins punched an official in the stomach at the post-match press conference. That combined with threatening to shoot Dennis Taylor at the 1990 World Cup a month earlier led to Higgins being banned from the entire 1990/1991 season.