a company which operates on the cutting edge of machine learning ...you may more effectively write
:......a company which operates the cutting edge learning machine and .......
This gives them, especially for him as an expert on that company
, a new perspective on what machines can and can't do, then finds[this verb should be refer to subject 'them']
out what jobs they ...
He started to reveal that machine learning
= learning machine
isn't just for simple tasks (...) sorting mail anymore, as
in early 90s.
it'sit is[avoid contraction in writing]
capable of far more complex applications, like grading high-school essays,
the most challenging ...
clearly shown that (...) performance at all the tasks
... we have no change to compet
against machines, however there areoverall, you have shown good progress in writing. good luck