Complex sentence: Standardized protocols that are deployed in Cisco products are not listed here; some standard protocols (such as MPLS) are listed here because the page shows that they were developed based on a Cisco proprietary protocol that does not have its own page.
Split into simpler sentences: Standardized protocols that are deployed in Cisco products are not listed here. Some standard protocols may be listed here because the page shows that they were developed based on a Cisco proprietary protocol that does not have its own page.