Complex sentence: Since the 1990s, Poseidonos Avenue became linked with another section of GR-89 Vouliagmenis Avenue, and further south is the road to Vari, Koropi and Eleftherios Venizelos International Airport.
Split into simpler sentences: Since the 1990s, Poseidonos Avenue has been linked with another section of GR-89, Vouliagmenis Avenue. Farther south is the road to Vari, Koropi and Eleftherios Venizelos International Airport.