Complex sentence: The area where Albany is located was formerly inhabited by the Creek Indians, who called it "Thronateeska" after their word for "flint" because of the mineral flint that was found near the river.
Split into simpler sentences: The area where Albany is located was formerly inhabited by the Creek Indians. They called it "Thronateeska" after their word for "flint" because of the mineral flint that was found near the river.