Complex sentence: By the arrangements of the Canadian federation, the Canadian monarchy operates in British Columbia as the core of the province's Westminster-style parliamentary democracy; and is thus the foundation of the executive, legislative, and judicial branches of the province's government.
Split into simpler sentences: By the arrangements of the Canadian federation, the Canadian monarchy operates in British Columbia as the core of the province's Westminster-style parliamentary democracy. It is thus the foundation of the executive, legislative, and judicial branches of the province's government.