Complex sentence: However, questions were raised about the long term use of fiberglass; rust and corrosion were also found on the steel frame skeleton and the anchor bolts holding the sculpture to the base were weakened.
Split into simpler sentences: However, questions were raised about the long term integrity of the fiberglass. An inspection found rust and corrosion on the steel frame skeleton and the revealed that the anchor bolts holding the sculpture to the base were weakened.