Complex sentence: A report released by the US think-tank the RAND Corporation in 2016 into the alleged Russian propaganda model it dubbed the "Firehose of Falsehood" called "Russian faux-news propaganda channels, such as RT" insidious.
Split into simpler sentences: A report released by the US think-tank the RAND Corporation in 2016 identified RT as part of a wider Russian propaganda operation it dubbed the "Firehose of Falsehood". The paper called "Russian faux-news propaganda channels, such as RT" insidious.