Complex sentence: Conidia are between globular and elliptical in shape, and form at the mouth of short annellidic conidiogenous cells, although annellations can only be observed by electron microscopy.
Split into simpler sentences: Conidia are between globular and elliptical in shape, and form at the mouth of short annellidic conidiogenous cells. Aannellations can only be observed by electron microscopy.