Complex sentence: The purchase was not popular in the contiguous United States, where Alaska became known as "Seward's Folly" or "Seward's Icebox", however the resources of Alaska would soon show that this was a wise buy.
Split into simpler sentences: The purchase was not popular in the contiguous United States, where Alaska became known as "Seward's Folly" or "Seward's Icebox". However, the resources of Alaska would soon show that this was a wise buy.