Complex sentence: The crater is named after Posidonius, a Greek Stoic philosopher, politician, astronomer, geographer, historian and teacher, it was given its name by Giovanni Riccioli as Possidonius, whose 1651 nomenclature system has become standardized.
Split into simpler sentences: The crater is named after Posidonius, a Greek Stoic philosopher, politician, astronomer, geographer, historian and teacher. It was given its name by Giovanni Riccioli as Possidonius, whose 1651 nomenclature system has become standardized.