Complex sentence: He is very hyperactive and often messes with his sisters' inventions, causing trouble and mayhem, but just as often shows his intelligence, such as by frequently tricking his genius sisters or saving the day from the latest danger.
Split into simpler sentences: He is very hyperactive and often messes with his sisters' inventions, causing trouble and mayhem. But just as often shows his intelligence, such as by frequently tricking his genius sisters or saving the day from the latest danger.