Complex sentence: Reactivated as a Strategic Air Command B-29 Superfortress squadron at MacDill Field, Florida in 1948, the squadron began upgrading to the new B-50 Superfortress, an advanced version of the B-29, in 1950.
Split into simpler sentences: Reactivated as a Strategic Air Command B-29 Superfortress squadron at MacDill Field, Florida in 1948. Began upgrading to the new B-50 Superfortress, an advanced version of the B-29 in 1950.