Complex sentence: The tower contains 37 floors, and when completed in 1974, held the title of tallest building in the city until 1990, when the Bank of America Tower surpassed it in height.
Split into simpler sentences: The tower contains 37 floors, and was completed in 1974. It held the title of tallest building in the city from its completion until 1990, when the Bank of America Tower surpassed it in height.