Complex sentence: Nearing the end of the original series, the last broadcast of the Indie Chart occurred much earlier than that of the other charts due to the reduced number of specialist chart slots available given the space requirements of the Formula One coverage at the time.
Split into simpler sentences: Nearing the end of the original series, the last broadcast of the Indie Chart occurred much earlier than that of the other charts. This was due to the reduced number of specialist chart slots available given the space requirements of the Formula One coverage at the time.