Complex sentence: The Instituto Nacional de Antropología e Historia has the park, as well as the Castle of Chapultepec on the hill listed as Mexican heritage sites, and has submitted the area for consideration as a World Heritage Site.
Split into simpler sentences: The Instituto Nacional de Antropología e Historia has the park, as well as the Castle of Chapultepec on the hill, listed as Mexican heritage sites. They submitted the area for consideration as a World Heritage Site.