elle lui a expliqué
She explained to him why she didn't like his parents.
Elle lui a expliqué pourquoi elle n’aimait pas ses parents.
She explained to him why she was late.
Elle lui expliqua pourquoi elle était en retard.
She explained to him how to solve the puzzle.
Elle lui a expliqué comment résoudre le puzzle.
She explained to him why she couldn't visit him.
Elle lui a expliqué pourquoi elle ne pouvait pas lui rendre visite.