Complex sentence: The fire was smothered using 70,000 gallons of foam and a major cleanup of area around the bottom of the shaft (27th level) was necessary, as it filled with dense foam from floor to ceiling.
Split into simpler sentences: The fire was smothered using 70,000 gallons of foam. There is now a major cleanup of area around the bottom of the shaft (27th level), as it is filled with dense foam from floor to ceiling.