Complex sentence: Shantou Institute of Ultrasonic Instruments Co., Ltd (SIUI) is the largest and longest manufacturer of Ultrasound in China and has been dedicated to R&D and manufacture of ultrasound systems since 1978.
Split into simpler sentences: Shantou Institute of Ultrasonic Instruments Co., Ltd (SIUI) is the largest manufacturer of Ultrasound in China with longest history. It has been dedicated to R&D and manufacture of ultrasound systems since 1978.