Today these casts are studied by researchers tracing the history of the Maya through their hieroglyphic writing, because the casts are in better condition than the original monuments, which have suffered some weathering and erosion since the casts were made.
Today these casts are studied by researchers. These researchers are tracing the history of the Maya through their hieroglyphic writing. The casts are in better condition than the original monuments. The original monuments have suffered some weathering and erosion. The casts were made.