Complex sentence: In May 1794, Howe led the fleet to sea to search for a French grain convoy and after a month of fruitless searching, discovered that the French Atlantic Fleet under Villaret de Joyeuse had left harbour and was sailing to meet the convoy.
Split into simpler sentences: In May 1794, Howe led the fleet to sea to search for a French grain convoy. After a month of fruitless searching, Howe discovered that the French Atlantic Fleet under Villaret de Joyeuse had left harbour and was sailing to meet the convoy.