Complex sentence: Alvarado retreated and sent Mexican Indian messengers to demand that the Cuzcatlec warriors return the stolen weapons and surrender to the Spanish king, to which the Cuzcatlec responded with the famous response, "If you want your weapons, come get them".
Split into simpler sentences: Alvarado retreated and sent Mexican Indian messengers to demand that the Cuzcatlec warriors return the stolen weapons and surrender to the Spanish king. The Cuzcatlec responded with the famous response, "If you want your weapons, come get them".