Complex sentence: On December 30 of the same year, a young Bolivian named Ugo Ungaza Villegas threw a rock at the painting; this resulted in the loss of a speck of pigment near the left elbow, which was later painted over.
Split into simpler sentences: On December 30 of the same year, a young Bolivian named Ugo Ungaza Villegas threw a rock at the painting. This resulted in the loss of a speck of pigment near the left elbow, which was later painted over.