Complex sentence: By this means, the recession velocity of Aldebaran was estimated as (48 km/s) at Potsdam Observatory by Hermann C. Vogel and his assistant Julius Scheiner.
Split into simpler sentences: By this means, the recession velocity of Aldebaran was estimated as (48 km/s). This work was performed at Potsdam Observatory by Hermann C. Vogel and his assistant Julius Scheiner.