Simplify the following text for a Grade 11 native English-speaking person.
Original: The Convention on the Rights of Persons with Disabilities is an international human rights instrument of the United Nations intended to protect the rights and dignity of persons with disabilities . Parties to the Convention are required to promote , protect , and ensure the full enjoyment of human rights by persons with disabilities and ensure that they enjoy full equality under the law .
Simplified: The purpose of this convention is to promote , protect and ensure that all persons with disabilities enjoy all human rights and freedoms and to respect their dignities .