Complex sentence: It is noted that the Earth was abandoned in the 29th century due to solar flares; this was a central plot point of the classic serials "The Ark in Space" and "The Sontaran Experiment".
Split into simpler sentences: It is noted that the Earth was abandoned in the 29th century due to solar flares. This was a central plot point of the classic serials "The Ark in Space" and "The Sontaran Experiment".