Complex sentence: One of a group of corvettes transferred to the U.S. Navy under reverse Lend-Lease, she was commissioned as USS "Impulse" at London on 16 March 1942, Lt. C. M. Lyons in command.
Split into simpler sentences: One of a group of corvettes transferred to the U.S. Navy under reverse Lend-Lease, she was commissioned as USS "Impulse" in March 1942. She was commissioned as USS "Impulse" at London on 16 March 1942 with Lt. C. M. Lyons in command.