Complex sentence: Mara Salvatrucha (commonly abbreviated as MS, Mara, and MS-13) is a transnational criminal gang that originated in Los Angeles and has spread to other parts of the United States, Canada, Mexico, and Central America.
Split into simpler sentences: Mara Salvatrucha (MS-13) is an international criminal gang that originated in Los Angeles, California. It has spread to other parts of the United States, Canada, Mexico, and Central America.