Simplify the following text for a Grade 9 native English-speaking person.
Original: This is one reason why dislocated joints must be set as quickly as possible : if the ligaments lengthen too much , then the joint will be weakened , becoming prone to future dislocations .
Simplified: This is one reason why dislocated joints must be set as quickly as possible : if the ligaments lengthen too much , then the joint will be weakened .