Complex sentence: Weaver himself won with his own work "Sanctuary" in 1974 which he presented to the Herron School of Art as a way of giving back to the institution for all it had done for him.
Split into simpler sentences: Weaver himself won with his own work "Sanctuary" in 1974. Weaver presented "Sanctuary" to the Herron School of Art as a way of giving back to the institution for all it had done for him.