Complex sentence: From 1946 until 1958 it was renamed Gatwick Racecourse, even though racing had been abandoned in 1940 and not been re-instated after the Second World War: the station had fallen out of use following the opening of Tinsley Green/Gatwick airport station (described below).
Split into simpler sentences: From 1946 until 1958 Gatwick station was renamed Gatwick Racecourse, even though racing had been abandoned in 1940 and not been re-instated after the Second World War. In fact the station had fallen out of use following the opening of the nearby Tinsley Green/Gatwick airport station (described below).