Complex sentence: Reunion National Park's core mission is to safeguard the island's endemic species, in contrast to Guiana Amazonian Park in French Guiana, which was established at the same time, but in order to protect the biodiversity within its boundaries.
Split into simpler sentences: Reunion National Park's core mission is to safeguard the island's endemic species. This is in contrast to Guiana Amazonian Park in French Guiana, which was established at the same time, but in order to protect the biodiversity within its boundaries.