Complex sentence: The Cochrane Collaboration's review on the treatment of adult ADHD with amphetamines stated that amphetamines markedly improve short-term symptoms, but possess higher discontinuation rates than non-stimulant medications for ADHD due to their adverse effects.
Split into simpler sentences: The Cochrane Collaboration's review on the treatment of adult ADHD with amphetamines stated that amphetamines markedly improve short-term symptoms. Amphetamines possess higher discontinuation rates than non-stimulant medications for ADHD due to their adverse effects.