Complex sentence: Keppel put to sea from Spithead on 9 July 1778, with a force of 30 ships of the line and sighted a French fleet of 29 sail west of Ushant on 23 July.
Split into simpler sentences: Keppel put to sea from Spithead on 9 July 1778 with a force of 30 ships of the line. He sighted a French fleet of 29 sail west of Ushant on 23 July.