Complex sentence: Instead of having McKinley travel to see the voters, Mark Hanna brought thousands of voters by train to McKinley's home; once there McKinley would greet the groups of voters and give a speech to them from his porch.
Split into simpler sentences: Instead of having McKinley travel to see the voters, Mark Hanna brought thousands of voters by train to McKinley's home. Once there, McKinley would greet the groups of voters and give a speech to them from his porch.