Complex sentence: The 1978 W.A.K.O. European championships were open to amateur men based in Europe only, with each country allowed more than one competitor in an individual weight category, with a new category, Semi-Contact, being introduced alongside the existing Full-Contact category.
Split into simpler sentences: The 1978 W.A.K.O. European championships were open to amateur men based in Europe only, with each country allowed more than one competitor in an individual weight category. The event also heralded a new category, Semi-Contact, which was introduced to feature alongside the existing Full-Contact category.