Complex sentence: Spain participated along with France, the United Kingdom, Italy, Denmark, the United States and Canada in the offensive against Gaddafi in Libya, contributing with a tanker, 4 F-18 fighter jets, a frigate, a submarine and a surveillance aircraft.
Split into simpler sentences: Spain participated along with the allies (France, United Kingdom, Italy, Denmark, United States and Canada) in the offensive against Gaddafi in Libya. Spain contributed with a tanker, 4 F-18, a frigate, a submarine and a surveillance aircraft.