Complex sentence: An example of a receptor that possesses basal activity and for which inverse agonist have been identified is the GABA A receptor for which agonists have a sedative effect while inverse agonists have a convulsive effect.
Split into simpler sentences: An example of a receptor that possesses basal activity and for which inverse agonist have been identified is the GABA A receptor. Agonists for the GABA A receptor elicit a sedative effect while inverse agonists have a convulsive effect.