Complex sentence: People who do not enjoy thinking can rely on experts and trustworthy sources to conserve their cognitive resources.However if the expert source is untrustworthy, then the person might have to evaluate the material on their own.
Split into simpler sentences: People who do not enjoy thinking can rely on experts and trustworthy sources to conserve their cognitive resources. If the expert source is untrustworthy, then the person might have to evaluate the material on their own.