Complex sentence: By blocking the dopamine and norepinephrine transporter, the reuptake of dopmaine and norepinephrine cannot function and this causes an increase of dopamine and norepinephrine in the synapse and methylphenidate functions in a similar way to cocaine.
Split into simpler sentences: By blocking the dopamine and norepinephrine transporter, the reuptake of dopamine and norepinephrine cannot function. This causes an increase of dopamine and norepinephrine in the synapse and methylphenidate functions in a similar way to cocaine.