Question: William Alexander Watson Sheldon (18 January 1907 – 1 November 1999) was an Irish politician and farmer, he was re-elected as an independent or nonpartisan politician starting in which year? 
Sentence (from "Patrick O'Reilly (Cavan politician)"): He was elected as a Fine Gael TD for Cavan at the 1951, 1954, 1957 and 1961 general elections.
Relevant evidence: No