Complex sentence: The subjects chosen by Praxiteles were either human beings or the less elderly and dignified deities such as Apollo, Hermes and Aphrodite rather than Zeus, Poseidon or Athena.
Split into simpler sentences: The subjects chosen by Praxiteles were either human beings or the less elderly and dignified deities. It is Apollo, Hermes and Aphrodite who attract him rather than Zeus, Poseidon or Athena.