Complex sentence: Colima has a relatively short coastline with a length of 139 km or 1.2% of Mexico's total which extends from the Boca de Apiza to the Cerro de San Francisco in front of Barra de Navidad, Jalisco.
Split into simpler sentences: Colima has a relatively short coastline, at 139 km (1.2% of Mexico's total). It extends from the Boca de Apiza to the Cerro de San Francisco in front of Barra de Navidad, Jalisco.