Complex sentence: On 29 July 1809 "Salsette" escorted the vessels carrying the troops of Lieutenant-General Sir John Hope across the Channel where they were to participate in the Walcheren Expedition.
Split into simpler sentences: On 29 July 1809 "Salsette" escorted the vessels carrying the troops of Lieut. Gen. Sir John Hope across the Channel where they were to participate in the Walcheren Expedition.