Complex sentence: The tribes oppose the Confederated Tribes of Warm Springs' plans to build an off-reservation casino in Cascade Locks, Oregon, and spent over $800,000 on the issue in the 2006 primary races for Governor of Oregon.
Split into simpler sentences: The tribes oppose the Confederated Tribes of Warm Springs' plans to build an off-reservation casino in Cascade Locks, Oregon. They spent more than $800,000 on trying to influence decisions on the issue in the 2006 primary races for Governor of Oregon.