Complex sentence: He began his career in the music business with the record label ECM Records in his hometown of Munich in the mid- 1970s and was associated with the German label for twelve years before moving to the United States in 1986.
Split into simpler sentences: He began his career in the music business with the record label ECM Records in his hometown of Munich in the mid- 1970s. He was associated with the German label for twelve years before moving to the United States in 1986.