Definition: Rewrite each original sentence in order to make it easier to understand by non-native speakers of English. You can do so by replacing complex words with simpler synonyms (i.e. paraphrasing), deleting unimportant information (i.e. compression), and/or splitting a long complex sentence into several simpler ones. The final simplified sentences need to be grammatical, fluent, and retain the main ideas of their original counterparts without altering their meanings.
Input: They would later return to the revived series in the 2008 Christmas Special "The Next Doctor", introducing two new variants of the race; the Cyber-Shades and the Cyber-King.

They returned to the series in the 2008 Christmas Special "The Next Doctor". And started two new races; the Cyber-Shades and the Cyber-King.