Complex sentence: Andromeda IX (And 9) is a dwarf spheroidal satellite of the Andromeda Galaxy, it was discovered in 2004 by resolved stellar photometry from the Sloan Digital Sky Survey (SDSS), by Zucker et al.
Split into simpler sentences: Andromeda IX (And 9) is a dwarf spheroidal satellite of the Andromeda Galaxy. It was discovered in 2004 by resolved stellar photometry from the Sloan Digital Sky Survey (SDSS), by Zucker et al.