Using a stopwatch, he then timed a forklift traveling between those two marks, and calculated the speed to be "within 15 miles an hour."
(a forklift; traveling; between those two marks) (he; calculated; the speed; to be "within 15 miles an hour) (the speed; to be; within 15 miles an hour) (he; timed; a forklift traveling between those two marks; T:then)
a forklift he the speed he
traveling calculated to be timed
between those two marks
the speed to be "within 15 miles an hour
within 15 miles an hour
a forklift traveling between those two marks T:then