Complex sentence: Barbados, Saint Vincent and the Grenadines, and Grenada also activated their CDERA response systems although they were not directly affected by the hurricane and merely used the opportunity to test the systems' operating procedures.
Split into simpler sentences: Barbados, Saint Vincent and the Grenadines, and Grenada also activated their CDERA response systems. Although they were not directly affected by the hurricane they used the opportunity to test the systems' operating procedures.