Simplify the following text for a Grade 7 native English-speaking person.
Original: Dignitas is a Swiss assisted dying group that helps those with terminal illness and severe physical and mental illnesses to die assisted by qualified doctors and nurses .
Simplified: Dignitas is a Swiss group that helps people with assisted suicide ( euthanasia ) . This means that , if a person is very ill and wants to die , the doctors and nurses help them to end their life .