Complex sentence: She was present with Admiral Lord Gambier at the blockade of Basque Roads in April 1809, where she was directed to dislodge the French who were endeavouring to strengthen their position in Aix roads.
Split into simpler sentences: She was present with Admiral Lord Gambier at the blockade of Basque Roads in April 1809. There she was directed to dislodge the French who were endeavouring to strengthen their position in Aix roads.