Simplify the following text for a Grade 5 native English-speaking person.
Original: She was third in the line of succession to the throne , behind her uncle , Edward , Prince of Wales , and her father .
Simplified: At her birth , she was third in the line of succession to the throne . This meant that if the king died , then the next in line was her uncle , the Prince of Wales and then her father , the Duke of York , and then her .