Definition: Rewrite each original sentence in order to make it easier to understand by non-native speakers of English. You can do so by replacing complex words with simpler synonyms (i.e. paraphrasing), deleting unimportant information (i.e. compression), and/or splitting a long complex sentence into several simpler ones. The final simplified sentences need to be grammatical, fluent, and retain the main ideas of their original counterparts without altering their meanings.
Input: In ancient times the sea was the birthplace of two ancient civilizations the Minoans of Crete and the Mycenean Civilization of the Peloponnese.

The Minoans of Crete and the Mycenean Civilization of the Peloponnese are ancient civilizations. The sea birthed these cultures.