Complex sentence: An inductor using a core to increase inductance will have other losses in the core, such as hysteresis and eddy current losses, in addition to wire resistance, that are also represented as a higher ESR.
Split into simpler sentences: An inductor using a core to increase inductance will have other losses in the core, such as hysteresis and eddy current losses. These are in addition to wire resistance and are also represented as a higher ESR.