Simplify the following text for a Grade 9 native English-speaking person.
Original: The central span of 200 feet ( 61 m ) between the towers is split into two equal bascules or leaves , which can be raised to an angle of 83 degrees to allow river traffic to pass .
Simplified: The central span of 200 feet ( 61 m ) between the towers is split into two equal bascules or leaves , which can be raised to an angle of 83o to allow river traffic to pass .