Complex sentence: Galanin in the hippocampus is an inhibitor of glutamate but not GABA and, as such, is capable of increasing the seizure threshold and, therefore, is expected to act as an anticonvulsant.
Split into simpler sentences: Galanin in the hippocampus is an inhibitor of glutamate but not of GABA. This means that galanin is capable of increasing the seizure threshold and, therefore, is expected to act as an anticonvulsant.