Simplify the following text for a Grade 11 native English-speaking person.
Original: Thus , Waterloo station ( since renamed Yau Ma Tei Station ) became the terminus of the Kwun Tong Line , and both Argyle and Prince Edward stations became interchange stations .
Simplified: Thus , Waterloo became the terminus of the Kwun Tong Line , and both Argyle and Prince Edward stations became interchange stations .