Complex sentence: He kept his place for the last game of that season, and spent the next season as cover for Briggs; unfortunately for him, Briggs missed only one game, and in August 1927 Castle signed for Shrewsbury Town of the Birmingham & District League.
Split into simpler sentences: He kept his place for the last game of that season, and spent the next season as cover for Briggs. Unfortunately for him, Briggs missed only one game, and in August 1927 Castle signed for Shrewsbury Town of the Birmingham & District League.