Complex sentence: Many supporters of the Gamergate movement state that the movement is concerned about ethical issues in video game journalism; however, its most notable actions have been sexist and misogynistic attacks on game developers Zoe Quinn and Brianna Wu, cultural critic Anita Sarkeesian and others.
Split into simpler sentences: Many supporters of the Gamergate movement are concerned about ethical issues in video game journalism. It's most notable actions have been sexist and misogynistic attacks on game developers Zoe Quinn and Brianna Wu, cultural critic Anita Sarkeesian and others.