Complex sentence: The 100th Bombardment Wing was later converted to a strategic reconnaissance wing and transferred to Davis-Monthan AFB, Arizona, leaving the 509th Bombardment Wing as the principal host wing for Pease AFB.
Split into simpler sentences: The 100th Bombardment Wing was later converted to a strategic reconnaissance wing and transferred to Davis-Monthan AFB, Arizona. This left the 509th Bombardment Wing as the principal host wing for Pease AFB.