Complex sentence: Methylphenidate, or as it's more commonly known as ritalin is a psychomotor stimulant that blocks the dopamine transporter, blocking the reuptake of dopmaine and causing an increase in dopamine in the synapse and works in a similar way to cocaine.
Split into simpler sentences: Methylphenidate, or as it's more commonly known as ritalin is a psychomotor stimulant that blocks the dopamine transporter. By blocking the dopamine transporter, the reuptake of dopmaine cannot function and this causes an increase in dopamine in the synapse and works in a similar way to cocaine.