Complex sentence: Scopolamine and atropine have similar effects on the peripheral nervous system, however, scopolamine has greater effects on the Central Nervous System (CNS) than atropine due to its ability to cross the blood--brain barrier.
Split into simpler sentences: Scopolamine and atropine have similar effects on the peripheral nervous system. However, scopolamine has greater effects on the Central Nervous System (CNS) than atropine due to its ability to cross the blood--brain barrier.