Complex sentence: This may not have concerned O'Halloran a great deal, however; he appeared to be content to remain as Opposition Leader, once telling an acquaintance I wouldn't want to be Premier even if I could be.
Split into simpler sentences: This may not have concerned O'Halloran a great deal, however. Indeed, he appeared to be content to remain as Opposition Leader, once telling an acquaintance I wouldn't want to be Premier even if I could be.