Complex sentence: KOAC-AM-TV soon became the primary station for a large state network of radio and television stations, which became known as the Oregon Educational and Public Broadcasting Service (OEPBS) in 1971.
Split into simpler sentences: KOAC-AM-TV soon became the primary station for a large state network of radio and television stations. Originally known as Oregon Educational Broadcasting, it became as the Oregon Educational and Public Broadcasting Service (OEPBS) in 1971.