Complex sentence: The show is set in Superman's home planet, approximately 200 years before the time period of the "Man of Steel" film it is the first DC-produced tv show to take place in the DC Extended Universe.
Split into simpler sentences: The show is set in Superman's home planet, approximately 200 years before the time period of the "Man of Steel". It is the first DC-produced TV series to take place in the DC Extended Universe.