Complex sentence: Being non-invasive, accurate and inexpensive, Doppler ultrasound is a routine part of clinical ultrasound; it has high levels of reliability and reproducibility, and has been in clinical use since the 1960s.
Split into simpler sentences: Being non-invasive, accurate and inexpensive, Doppler ultrasound is a routine part of clinical ultrasound with high levels of reliability and reproducibility. It has been in clinical use since the 1960s.