Complex sentence: Some ADHD symptoms in adults differ from those seen in children--for example whereas children with ADHD may climb and run about excessively, adults may experience an inability to relax and talk excessively in social situations.
Split into simpler sentences: Some ADHD symptoms in adults differ from those seen in children. For example, while children with ADHD may climb and run about excessively, adults may experience an inability to relax, and talk excessively in social situations.