Complex sentence: Greek colonies and communities have been historically established in most corners of the Mediterranean and the Black seas, but Greeks have always been centered on the Aegean and Ionian seas, where the Greek language has been spoken since the Bronze Age.
Split into simpler sentences: Greek colonies and communities have been historically established in most corners of the Mediterranean and the Black seas. But Greeks have always been centered on the Aegean and Ionian seas, where the Greek language has been spoken since the Bronze Age.