Complex sentence: However, he felt himself falling into a rut, and feeling the same bandmates, and the same musical genres that he'd been producing and touring for 3 years were too predictable; too stifling.
Split into simpler sentences: However, he felt himself falling into a rut. Believing that continuing to compose and perform with the same bandmates, and the same musical genres that he'd been producing and touring for 3 years were too predictable; too stifling.