Complex sentence: At the same time, Valchek expresses his dislike for Prez, stating that he is burdensome, that he had warned his daughter not to marry Prez, and that he only guided Prez through the department on his daughter's behalf.
Split into simpler sentences: At the same time, Valchek expresses his dislike for Prez, stating that he is burdensome and that he had warned his daughter not to marry Prez. Valchek furthermore says he has only guided Prez through the department on his daughter's behalf.