Complex sentence: Along the rest of the trip, the three still find themselves in several mishaps, but each setback only strengthens their relationship, however, their bond is ultimately tested when Nick's navigator is set ablaze and explodes.
Split into simpler sentences: Along the rest of the trip, the three still find themselves in several mishaps, but each setback only strengthens their relationship. However, their bond is ultimately tested when Nick's navigator is set ablaze and explodes.