Complex sentence: He founded the seminal English Alternative rock magazine "ZigZag" in April 1969 and was editor from start-up until February 1973 and again from March 1976 until July 1977, was an A&R man for B&C Charisma Records, and manager of Starry Eyed and Laughing.
Split into simpler sentences: He founded the English Alternative rock magazine "ZigZag" in April 1969 and was editor from its beginning until February 1973, and again from March 1976 until July 1977. He was also an A&R man for B&C Charisma Records, and manager of Starry Eyed and Laughing.