Complex sentence: The globus pallidus is a major component of the basal ganglia core and consists of the striatum and its direct targets, the globus pallidus and the substantia nigra.
Split into simpler sentences: The globus pallidus is a major element of the basal ganglia system. In this system, it is a major constituent of the basal ganglia core, which consists of the striatum and its direct targets: globus pallidus and substantia nigra.