Complex sentence: Note that the state of one system can be identically entangled with the state of another system, such as by using a CNOT gate, but this does not constitute cloning since no well defined state can be attributed to a subsystem of an entangled state.
Split into simpler sentences: Note that the state of one system can be entangled with the state of another system. This does not constitute cloning since no well-defined state can be attributed to a subsystem of an entangled state.