Complex sentence: The Rua Augusta Arch is a stone, triumphal arch-like, historical building and visitor attraction in Lisbon, Portugal, on Commerce Square, built to commemorate the city's reconstruction after the 1755 earthquake.
Split into simpler sentences: The Rua Augusta Arch is a stone, triumphal arch-like, historical building and visitor attraction in Lisbon, Portugal, on Commerce Square. It was built to commemorate the city's reconstruction after the 1755 earthquake.