Complex sentence: Greenway's second and third majorities were based almost entirely on popular support for his education reforms; with education issue resolved in 1896, the Conservatives suddenly had a viable chance to form government.
Split into simpler sentences: Greenway's second and third majorities, however, were almost entirely based on popular support for his education reforms. When the education issue was resolved in 1896, the Conservatives suddenly had a viable chance to form government.