Complex sentence: Those opposed to joining the task force adopted the "Keep Portland Weird" slogan to point out that Portland was different from other cities and should continue to opt out of the task force and not join with other government forces.
Split into simpler sentences: Those opposed to joining the task force adopted the "Keep Portland Weird" slogan to point out that Portland was different from other cities. They stated Portland should have continued to opt out of the task force and not join with other government forces.