Complex sentence: When the ship wrecked off East Caicos in March 1841 all the 20 crew members and 193 Africans aboard survived, suggesting that around 100 had died during the Atlantic crossing, a typical loss for a venture of this kind.
Split into simpler sentences: When the ship wrecked off East Caicos in March 1841 all the 20 crew members and 193 Africans aboard survived. This suggested that around 100 slaves had died during the Atlantic crossing, a typical loss for a venture of this kind.