Complex sentence: But Juan Leal requested to get more and better transportation and tools and from there the people moved to the City of Mexico to talk with the Viceroy, who was committed to providing more resources for the trip.
Split into simpler sentences: But Juan Leal requested to get more, seeking better transportation and tools. From there the people moved to the City of Mexico to talk with the Viceroy, who was committed to providing more resources for the trip.