Complex sentence: The treaty resulted in the lands being ceded to the United States and many Spanish land grants are listed by name in the Treaty of Guadalupe-Hidalgo that was signed in 1848, two years later.
Split into simpler sentences: The treaty resulted in the lands being ceded to the United States and many of the Spanish Land Grants are listed by name in the Treaty of Guadalupe-Hidalgo. Which was signed in 1848, two years later.