Complex sentence: The abolition of slavery occurred at different times in different countries, and sometimes though it frequently occurred sequentially in more than one stage: for example, as abolition of the trade in slaves in a specific country, and then as abolition of slavery throughout empires.
Split into simpler sentences: The abolition of slavery occurred at different times in different countries. It frequently occurred sequentially in more than one stage-for example, as abolition of the trade in slaves in a specific country, and then as abolition of slavery throughout empires.