Complex sentence: Historically, however, WDGY was used as the call sign for another well-known station in the area from 1925 until 1991, today known as KFAN (see that article for more information).
Split into simpler sentences: Historically, however, WDGY was used as the call sign for another well-known station in the area from 1925 until 1991. Today it is known as KFAN (see that article for more information).