Complex sentence: On March 20th, 2003 radio station "102.1 the EDGE" in Dallas added "Calling You" to regular rotation, and it began to spread to radio stations across the country receiving over 56,585 spins on the US airwaves.
Split into simpler sentences: On March 20th, 2003 102.1 the EDGE in Dallas added "Calling You" into regular rotation. Soon "Calling You" began to spread on to radio stations across the country receiving over 56,585 spins on the US airwaves.