Complex sentence: In December 1984 he played one game for Barnet before joining St. Albans City and in the early 1990s Halsey would train with Barnet in Potters Bar to keep himself prepared for the rigours of officiating top flight games.
Split into simpler sentences: In December 1984 he played one game for Barnet before joining St. Albans City. In the early 1990s Halsey trained with Barnet in Potters Bar to keep himself prepared for the rigours of officiating top flight games.