Complex sentence: Caffeine (although an adenosine receptor antagonist) can counteract the anticholinergic symptoms by reducing sedation and increase acetylcholine activity, causing alertness and arousal can also be a possibility, however this sort of evidence is inconclusive.
Split into simpler sentences: Caffeine (although an adenosine receptor antagonist) would counteract the anticholinergic symptoms by reducing sedation and increase acetylcholine activity, causing alertness and arousal. Consumption of coffee can also be a possibility, however this sort of evidence is inconclusive.