Complex sentence: His government was moderate and initially a coalition of Liberals and Conservatives but suffered from defections by more radical Reformers who joined with the Clear Grits to form the opposition Liberal Party led by Edward Blake and Oliver Mowat.
Split into simpler sentences: His government was moderate and initially a coalition of liberals and conservatives, but suffered from defections by more radical Reformers. This group joined with the Clear Grits to form the opposition Liberal Party led by Edward Blake and Oliver Mowat.