Complex sentence: It turns out that the rhesus monkeys spent most of their time with the terry cloth mother, over the wire surrogate with a bottle of food, which indicates that they preferred touch, warmth, and comfort over sustenance.
Split into simpler sentences: It turns out that the rhesus monkeys spent most of their time with the terry cloth mother, over the wire surrogate with a bottle of food. Which indicates that they preferred touch, warmth, and comfort over sustenance.