Complex sentence: Monument of Aemilius Paullus was erected in the Sanctuary of Apollo at Delphi shortly after 167 BCE in order to commemorate the Roman victory at the Battle of Pydna over King Perseus of Macedon.
Split into simpler sentences: Monument of Aemilius Paullus was erected in the Sanctuary of Apollo at Delphi. Erected shortly after 167 BCE, the monument commemorates the Roman victory in the Battle of Pydna against King Perseus of Macedon.