Complex sentence: Nuclear cap-binding protein complex is a RNA-binding protein which binds to the 5' cap inside the nucleus, when RNA is exported to cytoplasm the nuclear cap-binding protein complex is replace by cytoplasmic cap binding complex.
Split into simpler sentences: Nuclear cap-binding protein complex is a RNA-binding protein which binds to the 5' cap inside the nucleus. When RNA is exported to the cytoplasm the nuclear cap-binding protein complex is replaced by cytoplasmic cap binding complex.