Complex sentence: In the first two matches of the 3-match series of representative matches between New South Wales and Queensland, the Blues players could only be sourced from clubs south of the border and the Maroons from only north of it.
Split into simpler sentences: In the first two matches of the 3-match series of representative matches between New South Wales and Queensland. The Blues players could only be sourced from south of the border and the Maroons only from north of it.