Complex sentence: The FXX's engine is based on the Enzo's but has been expanded to from, and output has been boosted from, as seen in the Enzo, to at 8,500 rpm.
Split into simpler sentences: The FXX's engine is based on the Enzo's, but displacement has been increased by from. Output has been boosted from the Enzo's, to at 8,500 rpm.