Complex sentence: Doppler spectroscopy, also known as radial velocity measurement and the "wobble method", is a spectroscopic method for finding extrasolar planets, involving the study of Doppler shifts in the spectrum of the star around which the planet orbits.
Split into simpler sentences: Doppler spectroscopy, also known as radial velocity measurement and the "wobble method", is a spectroscopic method for finding extrasolar planets. It involves the observation of Doppler shifts in the spectrum of the star around which the planet orbits.