Complex sentence: Initially "Moscovia" was the Latinized name of the city of Moscow itself, not of the state; later it acquired its wider meaning (synecdoche) and had being used alongside of the older name, Russia.
Split into simpler sentences: Initially "Moscovia" was the Latinized name of the city of Moscow itself, not of the state. But later it acquired its wider meaning (synecdoche) and had being used alongside of the older name, Russia.