Complex sentence: The Omni also features two indicator lights--one red, one green--to indicate whether the flow of history had been tampered with: a flashing red light meant history had been altered, and a steady green light meant that history was as it should be.
Split into simpler sentences: The Omni also features two indicator lights--one red, one green--to indicate whether the flow of history had been tampered with. A flashing red light meant history had been altered and a steady green light meant that history was as it should be.