Complex sentence: The effects of caffeine on short-term memory (STM) are controversial, findings are inconsistent as some effects of caffeine impair short-term and working memory, whereas other studies indicate enhancing effects on short-term and working memory.
Split into simpler sentences: The effects of caffeine on short-term memory (STM) are controversial. Findings are inconsistent as some effects of caffeine impair short-term and working memory, whereas other studies indicate enhancing effects on short-term and working memory.