Complex sentence: Sinus Meridiani is a now-obsolete name for an albedo feature on Mars stretching east-west just south of that planet's equator, named by the French astronomer Camille Flammarion in the late 1870s.
Split into simpler sentences: Sinus Meridiani is a feature name for an albedo feature on Mars stretching east-west just south of that planet's equator. It was named by the French astronomer Camille Flammarion in the late 1870s.