Complex sentence: They sold thousands of copies of their eponymous debut CD "Walker's Run" before taking a long-term hiatus in 2002 when their founder began his professional career as a United States Foreign Service Officer which takes him to long-term posts abroad.
Split into simpler sentences: They sold thousands of copies of their eponymous debut CD "Walker's Run" before taking a long-term hiatus in 2002. At this point their founder began his professional career as a United States Foreign Service Officer that takes him to long-term posts abroad.