Complex sentence: Oñate's capital of San Juan proved to be vulnerable to "Apache" (probably Navajo) attacks and a later governor, Pedro de Peralta, moved the capital and established the settlement of Santa Fe in 1610 at the foot of the Sangre de Cristo Mountains.
Split into simpler sentences: Oñate's capital of San Juan proved to be vulnerable to "Apache" (probably Navajo) attacks. Governor Pedro de Peralta moved the capital and established the settlement of Santa Fe in 1610 at the foot of the Sangre de Cristo Mountains.