Complex sentence: Afterward, Walter offers to remarry Hildy, promising to take her on the honeymoon they never had in Niagara Falls, but then Walter learns that there is a newsworthy strike in Albany, which is on the way to Niagara Falls by train.
Split into simpler sentences: Afterward, Walter tells Hildy they're going to remarry, and promises to take her on the honeymoon they never had in Niagara Falls. But then Walter learns that there is a newsworthy strike in Albany, which is on the way to Niagara Falls by train.