Complex sentence: He graduated from Nihon University's department of music at its faculty of art, and in 1978, began his career in music with his first music ensemble, 8 & 1/2, after which he worked with the group Halmens between 1979 and 1981.
Split into simpler sentences: He graduated from Nihon University's department of music at its faculty of art in 1978. During the same year, Ueno began his career in music with his first music ensemble, 8 & 1/2, after which he worked with the group Halmens between 1979 and 1981.