Complex sentence: Strategic Air Command had begun rotating B-29 squadrons to Europe beginning in 1946, however with the advent of the Berlin crisis, SAC stationed two squadrons to Goose Bay Air Base in Newfoundland, Canada where they were held in readiness for quick deployment to Europe.
Split into simpler sentences: Strategic Air Command had begun rotating B-29 squadrons to Europe beginning in 1946. With the advent of the Berlin crisis, SAC stationed two squadrons at Goose Bay Air Base in Newfoundland, Canada where they were held in readiness for quick deployment to Europe.