Complex sentence: They are traveling along a road when it becames a dead end with a roadblock, well the only person who know where the road leads is steve, because of his becaming familiar with the area trying to evade the feds for some time.
Split into simpler sentences: They are traveling along a road when it becomes a dead end with a roadblock. The only person who knows where the road leads is Steve, because of his familiarity with the area, while trying to evade Federal agents for some time.