Complex sentence: On 20 June 1803, after a shakedown period, she came into Plymouth for a refit, sailing again on 28 June under the command of Captain A. C. Dickson to join the Channel fleet.
Split into simpler sentences: On 20 June 1803, after a shakedown period, she came into Plymouth for a refit. She then sailed again on 28 June under the command of Captain A. C. Dickson to join the Channel fleet.