Complex sentence: Vacutainer ® is a trademark of Becton Dickinson for a kind of test tube, designed for venipuncture, that contain a vacuum that aspirates the correct amount of blood into a tube without the need for a syringe.
Split into simpler sentences: Vacutainer ® is a trademark of Becton Dickinson for a kind of test tube, designed for venipuncture. The vacutainer contains a vacuum that aspirates the correct amount of blood into a tube without the need for a syringe.