Complex sentence: It takes the pellets with its teeth direct from its anus, manipulates them with its fore-feet and examines them carefully, it then consumes some and rejects others, but the basis for its choice is unclear.
Split into simpler sentences: It takes the pellets with its teeth direct from its anus, manipulates them with its fore-feet and examines them carefully. It then consumes some and rejects others, but the basis for its choice is unclear.