Complex sentence: Tim tells him in no uncertain terms that he does not love Ivo and never has, that he is in love with Isabel and as soon as the cruise is over, he is going to leave to be with her.
Split into simpler sentences: Tim tells him in no uncertain terms that he does not love Ivo, and never has. That he is in love with Isabel and as soon as the cruise is over, he is going to leave to be with her.