Complex sentence: On the exterior south and east (front) elevations is a one-story base of pink granite, with high arched openings; it supports the red brick-and terra cotta-trimmed building shaft.
Split into simpler sentences: On the exterior south and east (front) elevations is a one-story base of pink granite. The base of pink granite and high arched openings supports the red brick and terra cotta trimmed building shaft.