Original sentence: The seat was held on a narrow three-figure majority by the Conservatives in Labour's landslide defeat of 1983, as it contained some strongly Conservative majority wards such as Graig, Marshfield and Allt-yr-yn
Edited sentence: The seat was held on a narrow three-figure majority by the Conservatives in Labour's landslide defeat of 1983, as it contained some favourable Tory wards such as Graig, Marshfield and Allt-yr-yn