Complex sentence: The Australian Tri-Series refers to the one day international cricket tournament held between 1979-80 and 2007-08 between the home side and two touring teams, in the height of the Australian cricket season, i.e. during the summer months of December, January and February.
Split into simpler sentences: The Australian Tri-Series refers to the one day international cricket tournament held in Australia each summer, and contested by Australia and two touring teams. The series is played during the height of the Australian cricket season, in the summer months of December, January and February.