Complex sentence: A few surviving serials were skipped, mostly all those featuring the Daleks, even when they had only made brief appearances, this was due to the BBC's disputes with the Estate of Terry Nation over the rights.
Split into simpler sentences: A few surviving serials were skipped, mostly all those featuring the Daleks, even when they had only made brief appearances. This was due to the BBC's disputes with the Estate of Terry Nation over the rights.