Complex sentence: In 1966, just after the 9th grade, he first volunteered for the DAO in Victoria, British Columbia--and his initial publication was the list of nearest stars in the 1970 "Observer's Handbook", when still in high school.
Split into simpler sentences: In 1966, just after 9th grade, he first volunteered for the DAO in Victoria, British Columbia. His initial publication was a list of nearest stars in the 1970 "Observer's Handbook", while he was still in high school.