Complex sentence: The idea of building a temple dedicated to the Blessed Sacrament in the city of Guadalajara began in the late 19th century, when a congregation of Catholics formed a committee to make this temple.
Split into simpler sentences: The idea of building a temple dedicated to the Blessed Sacrament in the city of Guadalajara began in the late 19th century. When a congregation of Catholics formed a committee to make this temple.