Simplify the following text for a Grade 12 native English-speaking person.
Original: MTR Corporation Limited has always been reliant on developing properties next to railway stations for its profits ( although the rail lines are profitable themselves ) ; many recently built stations are incorporated into large housing estates or shopping complexes .
Simplified: MTRCL has often developed properties next to stations to complement its already profitable railway business . Many recently built stations were incorporated into large housing estates or shopping complexes .