Complex sentence: In "Watching the Wheels" Lennon addresses those who were confounded by his "househusband" years, 1975--1980, during which he retired from the music industry to concentrate on raising his son Sean with Ono.
Split into simpler sentences: In "Watching the Wheels" Lennon addresses those who were confounded by his "househusband" years, 1975--1980. During this period, he "retired" from the music industry to concentrate on raising his son Sean with Ono.