Complex sentence: Andy "pushes" Rainbird to jump from the rafters of the stables and is shot by Rainbird and dies, from a combination stroke (due to the cumulative brain damage caused by using his "push" so much without rest) and bullet wound.
Split into simpler sentences: Andy "pushes" Rainbird to jump from the rafters of the stables, heavily damaging himself. Andy is then shot by Rainbird and dies, from a combination stroke (due to the cumulative brain damage caused by using his "push" so much without rest) and bullet wound.