Original: Unlike the Parliament of the United Kingdom, the powers of the Parliament of Canada were limited in that other powers were assigned exclusively to the provincial legislatures.
Simplified: Unlike the Parliament of the United Kingdom, the powers of the Parliament of Canada are limited, because provincial legislatures have the sole right to pass laws about some things. Until 1982 only the Parliament of the United Kingdom had the power to change the British North America Act, this was to protect the rights and powers of the provincial legislatures.