Complex sentence: When a lobster is cooked, its shell's colour changes from blue to orange because the heat from cooking breaks down a protein called crustacyanin, which suppresses the orange hue of the chemical astaxanthin, which is also found in the shell.
Split into simpler sentences: When a lobster is cooked, its shell's colour will change from blue to orange. This is because the heat from cooking breaks down a protein called crustacyanin, which suppresses the orange hue of the chemical astaxanthin, which is also found in the shell.