Complex sentence: Although both Rancho de las Pulgas and Rancho Cañada de Raymundo had been patented by the US Government, the boundaries of these two grants now overlapped, a problem that required an Act of Congress in 1878 to resolve.
Split into simpler sentences: Although both Rancho de las Pulgas and Rancho Cañada de Raymundo had been patented by the US Government, the boundaries of these two grants now overlapped. A problem that required an Act of Congress in 1878 to resolve.