Complex sentence: This economy would become increasingly important by the early 1900's; in 1906, Squamish and Tsleil-Waututh longshoremen formed the first union on the Vancouver waterfront, Local 526.
Split into simpler sentences: This economy would become increasingly important by the early 1900's. In 1906, Squamish and Tsleil-Waututh longshoremen formed the first union on the Vancouver waterfront, Local 526.