Complex sentence: A group of Mexicans are considered to be of entirely European heritage, many of these are the descendants of the Spanish colonial population called criollo mainly in northeastern Mexico, northwestern Mexico and the state of Jalisco.
Split into simpler sentences: A group of Mexicans are considered to be of entirely European heritage. Many of these are descendants of the Spanish colonial population called criollo mainly in northeastern Mexico, northwestern Mexico and the state of Jalisco.