Complex sentence: Oliver has twice guest-hosted Channel 4's "The Friday Night Project" and has made two appearances in the "Star in a Reasonably-Priced Car" segment of BBC Two's "Top Gear".
Split into simpler sentences: Oliver has twice guest-hosted Channel 4's "The Friday Night Project". He has also made two appearances in the "Star in a Reasonably-Priced Car" segment of BBC Two's "Top Gear".