Complex sentence: On June 17, de Alvarado arrived in Cuzcatlán, the lord of Cuzcatlan, Atlacatl put up a brave defense until defeated during a second approach by the Spanish and was executed.
Split into simpler sentences: On June 17, de Alvarado arrived in Cuzcatlán. Atlacatl, king of Cuzcutlan, put up a brave defense until defeated during a second approach by the Spanish and was executed.