Complex sentence: The Bucha effect is a seizure-inducing effect of light flashing at 1 Hz to 20 Hz, similar to epilepsy but not restricted to people with histories of epilepsy.
Split into simpler sentences: The Bucha effect is a seizure-inducing effect of light flashing at 1 Hz to 20 Hz. These seizures are similar to those caused by epilepsy, but are not restricted to people with histories of epilepsy.