Complex sentence: It was published ten times a year by the Vancouver Art Gallery from 1972 to 1984, and by the Vancouver Society for Critical Arts Publications from 1985 to 1989, when it ceased publication.
Split into simpler sentences: It was published ten times a year by the Vancouver Art Gallery from 1972 to 1984. The magazine was published by the Vancouver Society for Critical Arts Publications from 1985 to 1989, when it ceased publication.