Complex sentence: The Greek settlement in Old Smyrna is attested by the presence of pottery dating from about 1000 BC onwards and the most ancient ruins preserved to our day date back to 725--700 BC. Herodotus says that the city was founded by Aeolians and later seized by Ionians.
Split into simpler sentences: The Greek settlement in Old Smyrna is attested by the presence of pottery dating from about 1000 BC onwards. The most ancient ruins preserved to our times date back to 725--700 BC. According to Herodotus the city was founded by Aeolians and later seized by Ionians.