Simplify the following text for a Grade 4 native English-speaking person.
Original: Graham paid bail money to secure the release of Martin Luther King , Jr. from jail during the 1960s civil rights movement ; he invited King to join him in the pulpit at his 16-week revival in New York City in 1957 .
Simplified: Graham paid bail money to get Dr. Martin Luther King , Jr. out of jail . That was during the 1960s American Civil Rights Movement .