Complex sentence: It is of intermediate age (about 220 million years according to the Sky Catalog 2000) and contains a yellow giant of mag 7.9 and spectral type G0 as its brightest member-this corresponds to an absolute magnitude of -1.5, or a luminosity of 900 suns.
Split into simpler sentences: It is of intermediate age (about 220 million years, according to "Sky Catalog 2000") and features a yellow giant of apparent magnitude +7.9 and spectral type G0 as its brightest member. This corresponds to an absolute magnitude of -1.5, or a luminosity of 900 suns.