Complex sentence: On 1 November 1950, "Wallaceburg" was recommissioned as a cadet training vessel and spent the summers of 1956 and 1957 on the Great Lakes.
Split into simpler sentences: On 1 November 1950, "Wallaceburg" was recommissioned as a cadet training vessel. She spent the summers of 1956 and 1957 on the Great Lakes.