Complex sentence: The salad may include raw red peppers, shallots, artichoke hearts and other seasonal raw vegetables, but according to many sources, excludes cooked vegetables, except green beans and potatoes, which are commonly served in variations of "salade niçoise" around the world.
Split into simpler sentences: The salad may include raw red peppers, shallots, artichoke hearts and other seasonal raw vegetables. However, green beans and potatoes are commonly served in variations of salade niçoise, which are popular around the world.