Complex sentence: Blair lost his own seat in the 1892 election, due to Protestant opposition to his policy of accommodating Acadians and other Catholics (including appointing several to his cabinet and other government positions), but was able to re-enter the house through a by-election.
Split into simpler sentences: Blair lost his own seat in the 1892 election, due to Protestant opposition to his policy of accommodating Acadians and other Catholics. Blair was able to re-enter the house through a by-election.