Complex sentence: Newry City A.F.C. will use the old club's stadium, the Showgrounds, which is owned by Newry City F.C.'s season-ticket holders, which meant that it was not sold when Newry City F.C. was wound up.
Split into simpler sentences: Newry City A.F.C. will use the old club's stadium, the Showgrounds, which is owned by Newry City F.C.'s season-ticket holders. This meant that it was not sold when Newry City F.C. was wound up.