Complex sentence: During the construction of a railway extension in 2008, near the site of the ancient Greek colony of Himera, archeologists uncovered more than 10,000 graves that held the remains of 5th century B.C. soldiers.
Split into simpler sentences: During the construction of a railway extension in 2008, near the site of the ancient Greek colony of Himera, archeologists uncovered more than 10,000 graves. A number of those graves held the remains of 5th century B.C. soldiers.