Complex sentence: Others argue that he did have his own theories and beliefs, but there is much controversy over what these might have been, owing to the difficulty of separating Socrates from Plato and the difficulty of interpreting even the dramatic writings concerning Socrates.
Split into simpler sentences: Others argue that he did have his own theories and beliefs. However, there is much controversy over what these might have been, owing to the difficulty of separating Socrates from Plato and the difficulty of interpreting even the dramatic writings concerning Socrates.