Complex sentence: Despite becoming divided over the issue of Irish Home Rule, the party returned to power in 1906 with a landslide victory and, between then and the onset of World War I in 1914, Liberal governments oversaw the welfare reforms that created a basic British welfare state.
Split into simpler sentences: Despite becoming divided over the issue of Irish Home Rule, the party returned to power in 1906 with a landslide victory. Between then and the onset of World War I in 1914, Liberal governments oversaw the welfare reforms that created a basic British welfare state.