Complex sentence: Around 1984 France reiterated its requirement for a carrier-capable version and demanded a leading role; moreover, France demanded a swing-role fighter that was lighter than a design desired by the other four nations.
Split into simpler sentences: Around 1984 France reiterated its requirement for a carrier-capable version and demanded a leading role. It also demanded a swing-role fighter that was lighter than a design desired by the other four nations.