Complex sentence: Nearby is the national park of Ichkeul: site was protected by many international institutions (UNESCO and WWF) owing to the diversity of its fauna and its flora, it shelters the lake of the same name which would be the biggest natural lake of North Africa.
Split into simpler sentences: Nearby is the national park of Ichkeul, which contains sites protected by many international institutions (UNESCO and WWF), owing to the diversity of its fauna and its flora. It shelters the lake of the same name which is the biggest natural lake of North Africa.