His research involves studying the ways a system responds to changes in temperature and pressure and why and how it changes from solid to liquid to gas.
(His research; involves; studying the ways) (a system; responds; to changes in temperature and pressure and why and how it changes from solid to liquid to gas) (it; changes; from solid to liquid to gas)
His research a system it
involves responds changes
studying the ways
to changes in temperature and pressure and why and how it changes from solid to liquid to gas
from solid to liquid to gas