Complex sentence: It has been called a much bigger version of a Garibaldi biscuit, and it has been suggested that the origin of that biscuit may have been influenced by the black bun because the inventor of the biscuit, John Carr, was Scottish.
Split into simpler sentences: It has been called a much bigger version of a Garibaldi biscuit, and it has been suggested that the origin of that biscuit may have been influenced by the black bun. This was because the inventor of the biscuit, John Carr, was Scottish.