Complex sentence: When the thought confidence is high, people are more likely to use these thoughts as basis in forming attitudes, on the other hand, when people have low thought confidence, attitudes reformed based on other variables such as source credibility.
Split into simpler sentences: When the thought confidence is high, people are more likely to use these thoughts as basis in forming attitudes. On the other hand, when people have low thought confidence, attitudes are formed based on other variables such as source credibility.