Complex sentence: While it is difficult to gather demographic information on ideological groups, a recent surveys by the New York Times and CBS News, between 18% and 27% of American adults identify as liberal, versus moderate or conservative.
Split into simpler sentences: While it is difficult to gather demographic information on ideological groups, some studies have been conducted. According to recent surveys by the New York Times and CBS News, between 18% and 27% of American adults identify as liberal, versus moderate or conservative.