Complex sentence: Previously D'Souza released the 2014 film' which portrayed United States history in a positive light, arguing against perceived liberal critiques of its history, including the theft of Native American and Mexican lands, black slavery, contemporary foreign policy, and its capitalist system.
Split into simpler sentences: Previously D'Souza released the 2014 film' which portrayed United States history in a more positive light. This was in contrast to perceived liberal critiques of its history, including the theft of Native American and Mexican lands, black slavery, contemporary foreign policy, and its capitalist system.