Complex sentence: Shielded twisted pair was used in IBM's Token Ring LAN implementation, but in 1984, StarLAN showed the potential of simple "unshielded" twisted pair by using Cat3 cable--the same simple cable used for telephone systems.
Split into simpler sentences: Shielded twisted pair was used in IBM's Token Ring LAN implementation. In 1984, StarLAN showed the potential of simple "unshielded" twisted pair by using Cat3 cable--the same simple cable used for telephone systems.