Simplify the following text for a Grade 11 native English-speaking person.
Original: The project was initiated due to overcrowding at Quarry Bay and persistent passenger complaints about the five-minute walk from the Island Line platforms to the Kwun Tong Line platform .
Simplified: The project was initiated due to overcrowding at Quarry Bay and persistent passenger complaints about the 5-minute walk from the Island Line station to the Kwun Tong Line station .