Simplify the following text for a Grade 5 native English-speaking person.
Original: Based on the design by army engineer Lt. Alexander Fraser , the British constructed a new city on a grid plan on delta land , bounded to the east by the Pazundaung Creek and to the south and west by the Yangon River .
Simplified: The British constructed a new city on a grid plan on delta land . It was bound to the east by the Pazundaung Creek and to the south and west by the Yangon River .