Complex sentence: They are member of the West Coast League and will begin play in 2014 at the 3,000-seat Yakima County Stadium replacing the Yakima Bears of the Northwest League who relocated to Hillsboro, Oregon and were renamed the Hillsboro Hops.
Split into simpler sentences: They are member of the West Coast League and began play in 2014 at the 3,000-seat Yakima County Stadium. They replaced the Yakima Bears of the Northwest League, who relocated to Hillsboro, Oregon, and were renamed the Hillsboro Hops.