Complex sentence: His first major volume "Requiem and Celebration" was published in 1969, and his reputation was enhanced in 1973 by the appearance of "Definition of a Waterfall" and his inclusion in Penguin Modern Poets.
Split into simpler sentences: His first major volume, "Requiem and Celebration", was published in 1969. His reputation was enhanced in 1973 by the appearance of "Definition of a Waterfall" and his inclusion in Penguin Modern Poets.