Complex sentence: In 1985, IBM went forward with the token ring network scheme and a NetBIOS emulator was produced to allow PC-Network applications to work over this new design, using the NBF protocol to provide the NetBIOS services over the IEEE 802.2 Logical Link Control layer.
Split into simpler sentences: In 1985, IBM went forward with the token ring network scheme and a NetBIOS emulator was produced to allow NetBIOS-aware applications from the PC-Network era to work over this new design. A new networking protocol, NBF, was simultaneously produced to allow NetBEUI (NetBIOS) to provide its services over token ring--specifically, at the IEEE 802.2 Logical Link Control layer.