Complex sentence: Simple paracetamol will work in 30-45 minutes, However modern smooth muscle relaxants, including those used as'tocolytics' to terminate labour, are effective and fast acting.
Split into simpler sentences: Simple paracetamol will work in 30-45 minutes. Modern smooth muscle relaxants, including those used as'tocolytics' to slow or halt childbirth, are effective and fast acting.