Complex sentence: Vascular structures, such as blood vessels, along with artificial vascular constructs, allow for the diffusion of key nutrients and oxygen, though they have not been fully integrated into the technique of bioprinting.
Split into simpler sentences: Vascular structures, such as blood vessels, along with artificial vascular constructs, allow for the diffusion of key nutrients and oxygen. However, they have not been fully integrated into the technique of bioprinting.