Complex sentence: He was a trustee of the Pomfret School, and gave the school a dormitory, Dunworth, in 1905, and the year after his son George died, the Clark Memorial Chapel.
Split into simpler sentences: He was a trustee of the Pomfret School, and gave the school a dormitory, Dunworth, in 1905. The year after his son George died, he donated the Clark Memorial Chapel.