Complex sentence: While Welsh mythology was already important in "A Glastonbury Romance" and "Maiden Castle" it became even more important after he and Phyllis Playter moved to Corwen, Wales, in 1935, first in the minor novel "Morwyn" (1937).
Split into simpler sentences: While Welsh mythology was already important in "A Glastonbury Romance" and "Maiden Castle" it became even more important after he and Phyllis Playter moved to Corwen, Wales, in 1935. First in the minor novel "Morwyn" (1937).