The Henderson family moved into an apartment on the 14th floor where is the complete subject and complete predicate

Subject = The Henderson family

Predicate = moved into an apartment on the 14th floor

Explanation:

Subject is the word referred to in a sentence. Subject, more simply, is the word that indicates in a sentence who is acting; who is receiving an action; who is in a situation.

In turn, the predicate is a basic sentence member attributing to a subject or independently expressing an activity, state, or property. It is usually a verb in a certain form or an auxiliary verb with a noun or adverbial form.