Complex sentence: The album topped the "Billboard" chart on three separate occasions during 1974, and finished the year as the top selling album in Australia and Canada, while in Britain it came second in the year-end standings, behind the compilation' by the Carpenters.
Split into simpler sentences: The album topped the "Billboard" chart on three separate occasions during 1974, and was the top selling album of that year in Australia and Canada. In Britain, it came second in the year-end standings, behind the compilation' by the Carpenters.