Complex sentence: The Hurricane wooden coaster and Shuttle Loop coaster were significant roller coasters by 1987 standards, but the $25 million dollar renovation made in 1987 didn't pay for a single attraction competitive with Disney.
Split into simpler sentences: The Hurricane wooden coaster and Shuttle Loop coaster were significant roller coasters by 1987 standards. Yet, the $25 million dollar renovation made in 1987 didn't pay for a single attraction competitive with Disney.