He was the first to use a telescope to explore and map the stars, planets and the moon.
(He; was; the first to use a telescope to explore and map the stars, planets and the moon) (the first; to use; a telescope; to explore and map the stars, planets and the moon) Context(the first to use,List([7, 23))):(the first; to use a telescope to map; the stars, planets and the moon)
the first to use,List([7, 23))
He the first the first
was to use to use a telescope to map
the first to use a telescope to explore and map the stars, planets and the moon
a telescope to explore and map the stars, planets and the moon
the stars, planets and the moon