Complex sentence: Lionel Trilling, an author and literary critic, described the technique that the middle and the lower class parents use over under-working and overworking their children's feelings causes them to seek approval of their feelings in the future.
Split into simpler sentences: Lionel Trilling, an author and literary critic, described the technique that the middle-and the lower-class parents use. Under-working and overworking their children's feelings causes them to seek approval of their feelings in the future.