Answer:
I have not found any question for this phrase, but if you mean that the sentence is well written or not, it is written correctly.
Step-by-step explanation:
This sentence is written in the past simple tense.
This tense states that an action began and ended in the past.
In this case the action was that the swimming team trained (entrenaba).
Entrenaba is the past conjugation of the verb Entrenar, and refers to the third person singular: "el equipo".
Given this information, we can say that the answer is Correct.