Simplify the following text for a Grade 13 native English-speaking person.
Original: The Convention on the Rights of Persons with Disabilities is a convention , that is , international agreement for rights and freedom of any person with disability of any kinds made according to laws based on Universal Declaration of Human Rights called international human rights law .
Simplified: 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 .