Complex sentence: Target released a novelisation of "Mission to Magnus" in 1990 written by Phillip Martin, based on a serial intended for Season 23 but scrapped after the series was put on an 18 month hiatus in March 1985.
Split into simpler sentences: Target released a novelisation of "Mission to Magnus" in 1990 written by Phillip Martin. This is based on a serial intended for Season 23, but this was scrapped after the series was put on an 18 month hiatus in March 1985.