Complex sentence: The Latin alphabet evolved from the visually similar Cumaean Greek version of the Greek alphabet, which was itself descended from the Phoenician abjad, while in turn was derived from Egyptian hieroglyphics.
Split into simpler sentences: The Latin alphabet evolved from the visually similar Cumaean Greek version of the Greek alphabet. The Greek alphabet, including the Cumaean version, descended from the Phoenician abjad while the Phoenician alphabet is derived from Egyptian hieroglyphics.