explained
v.v. to give details about something so that someone else can understand it. You use this when you make a difficult idea clear or give a reason for your actions.
v. to make something clear or easy to understand by describing or giving information about it. Often functions as a reporting verb to introduce a reason or a clarification.
She explained the rules of the game to us.
The doctor explained the results of the blood test in simple terms so the patient wouldn't feel overwhelmed.
The lead architect explained how the new ventilation system would significantly reduce the building's carbon footprint while maintaining a comfortable temperature year-round.
The verb is transitive; it takes a direct object or a 'that' clause. When used with a person, it requires the preposition 'to'.
He explained me the problemHe explained the problem to meExplain cannot take an indirect object (the person) directly; you must use 'to' before the person being addressed.