The first humans will walk on Mars, to begin a human settlement there.
(The first humans; will walk; L:on Mars; to begin a human settlement there) Context(The first humans will walk,List([0, 26))):(The first humans; will walk to begin; a human settlement; L:there)
The first humans will walk,List([0, 26))
The first humans The first humans
will walk will walk to begin
L:on Mars to begin a human settlement there
a human settlement L:there