Simple machines are useful because they can make a physical job easier by changing the amount or the direction of the force exerted to do work.
(Simple machines; are; useful; because they can make a physical job easier by changing the amount or the direction of the force exerted) (they; can make easier; a physical job) Context(they can make easier,List([35, 70))):(they; can make easier by changing; the amount or the direction of the force)
they can make easier,List([35, 70))
Simple machines they they
are can make easier can make easier by changing
useful because they can make a physical job easier by changing the amount or the direction of the force exerted
a physical job
the amount or the direction of the force