Complex sentence: After the release of the series "Making a Murderer", which concerned Kratz's prosecution of Steven Avery and Brendan Dassey, Kratz began receiving death threats and his Yelp page was flooded with negative comments criticizing his tactics during the case.
Split into simpler sentences: After the release of the series "Making a Murderer" which centered on Kratz's prosecution of Steven Avery and Brendan Dassey Kratz began receiving death threats. Additionally his Yelp page was flooded with negative comments criticizing his tactics during the case.