For s.t. to be clear, specific (of a fact); to be distinguishable.
Like inherited land (that has been divided); it is clear which (part) is for whom.
The leaves of the trees are not distinguishable when I look, because my eyes are not good.
To make s.t. clear (of a fact); specify particulars of s.t.
It should be made clear to him because he does not understand.
When you give something, specify which is for whom.
When they live in one household they do not specify particulars (what belongs to whom or who does what).
I cannot specify which (belongs) to each one of them because the land area is very small. (They have to use it together.)