Complex sentence: As an otariid, the California sea lion relies on its foreflippers to propel itself when swimming, and it can turn its hindflippers forward and walk on all fours, which gives it maneuverability on land.
Split into simpler sentences: As an otariid, the California sea lion relies on its foreflippers to propel itself when swimming. It can turn its hindflippers forward and walk on all fours, giving it maneuverability on land.