Complex sentence: After Roblin's defeat in the election of 1892, William Alexander Macdonald became the leader of the opposition; in 1893, his election for Brandon City was declared void, and he lost the subsequent by-election.
Split into simpler sentences: After Roblin's defeat in the election of 1892, William Alexander Macdonald became the leader of the opposition. In 1893, his election for Brandon City was declared void, and he lost the subsequent by-election.