Complex sentence: The second Hired armed cutter "Hero" was a cutter of ten 12-pounder carronades and 119 27/94 tons burthen (bm) that served the Royal Navy from 4 May 1809 to 11 November 1811.
Split into simpler sentences: The second hired armed cutter "Hero" was armed with ten 12-pounder carronades and was of 119 27/94 tons burthen (bm). She served the Royal Navy from 4 May 1809 to 11 November 1811.