Complex sentence: An associated pair of centrioles, arranged perpendicularly and surrounded by an amorphous mass of dense material (the pericentriolar material) constitutes the compound structure known as the centrosomeIncrease in centrioles can lead to unhealthy breast development.
Split into simpler sentences: An associated pair of centrioles, arranged perpendicularly and surrounded by an amorphous mass of dense material (the pericentriolar material) constitutes the compound structure known as the centrosome. An increase in centrioles can lead to unhealthy breast development.