Complex sentence: Neste Oil's renewable diesel refinery in Rotterdam (one of its largest plants) can annually produce 800,000 tons renewable diesel fuel, and over 65% of the feedstock used by this diesel plant is animal fats, including chicken fat.
Split into simpler sentences: Neste Oil's renewable diesel refinery in Rotterdam (one of its largest plants) can annually produce 800,000 tons renewable diesel fuel. Over 65% of the feedstock used by this diesel plant is animal fats, including chicken fat.