Complex sentence: Historically, slavery was legal throughout the British Empire until 1833, and it existed in all the British colonies of North America.Slavery in colonial US was legal and practiced in each of the Thirteen Colonies that became the US.
Split into simpler sentences: Historically, slavery was legal throughout the British Empire until 1833, and it existed in all the British colonies of North America. Slavery was legal and practiced in each of the Thirteen Colonies that became the US.