He discovered that, although matter may change its form or shape, its mass always remains the same.
(matter; may change; its form or shape) (He; discovered; that, although matter may change its form or shape, its mass always remains the same) Context(He discovered,List([0, 13))):(its mass; remains; the same; T:always)
He discovered,List([0, 13))
matter He its mass
may change discovered remains
its form or shape
that, although matter may change its form or shape, its mass always remains the same
the same T:always