Complex sentence: Note that all four words can also be used as determiners (followed by a noun), as in "those cars"; they can also then form the alternative pronominal expressions "this/that one", "these/those ones".
Split into simpler sentences: Note that all four words can also be used as determiners (followed by a noun), as in "those cars". They can also then form the alternative pronominal expressions "this/that one", "these/those ones".