Complex sentence: Corticopontine fibers, commonly referred to as corticobulbar fibers, are motor fibers that stretch from the precentral gyrus (motor strip) to the nuclei of cranial nerves V (trigenimal), VII (facial) and XII (hypoglossal).
Split into simpler sentences: Corticopontine fibers, commonly referred to as corticobulbar fibers, are projections from the cerebral cortex to the pontine nuclei. They are motor fibers that stretch from the precentral gyrus (motor strip) to the nuclei of cranial nerves V (trigenimal), VII (facial) and XII (hypoglossal).