If you have two things, you can say:
One thing is A, the other is B.
But is there any word group to describe three things that I have? I can only say with my poor English skills:
There are three things, one is A, one is B, one is C.
There are several different ways of mentioning the three things.
A direct parallel to the first example sentence in the question is actually different from the second example sentence:
Alternatively, you can introduce the list items with a colon or dash:
Perhaps the simplest and most direct construction follows: