Complex sentence: From early-2003, Attiki Odos was now operated from Kifissou Avenue to Eleftherios Venizelos Airport; the Hymettus Ring was almost paved by this phase, but tunnels were already complete.
Split into simpler sentences: From early-2003, Attiki Odos was now operated from Kifissou Avenue to Eleftherios Venizelos Airport. The Hymettus Ring was almost paved by this phase, but tunnels were already complete.