Complex sentence: It has been said that, with his drinking habit, he exercised a "bad influence" upon the Aborigines, four of whom died during or shortly after the tour; one death, that of Watty, was officially linked to alcohol.
Split into simpler sentences: It has been said that he exercised a "bad influence" upon the Aborigines with his drinking habit. Four players died on tour; one death, that of Watty, was officially linked to alcohol.