Complex sentence: He at first was reluctant to have Voltron reactivated, believing diplomacy could be used to make peace with Lotor, but over time he comes to accept Voltron as a necessary ally.
Split into simpler sentences: He at first was reluctant to have Voltron reactivated, believing diplomacy could be used to make peace with Lotor. But over time, he comes to accept Voltron as a necessary ally.