Complex sentence: Compared with most population centres in Australia it has colder winters, especially in terms of its daytime maximum temperatures, and in summer the average (and absolute) maximum temperatures are also lower than in most inland centres, on account of its elevation.
Split into simpler sentences: Compared with most population centres in Australia it has colder winters, especially in terms of its daytime maximum temperatures. In summer, the average (and absolute) maximum temperatures are also lower than in most inland centres, on account of its elevation.