Complex sentence: In the early 1830s, when William Wilberforce's anti-slavery act went into effect, HMS "Pelorus" became an anti-slaver ship, tasked with patrolling the west coast of Africa.
Split into simpler sentences: In the early 1830s, when William Wilberforce's anti-slavery act went into effect, the HMS "Pelorus" became an anti-slaver ship. Tasked with patrolling the west coast of Africa.