Complex sentence: Later in the year, Elliott ran an outstanding 1:42.97 in Seville (ranked No.1 in the world 1990 & third fastest Briton of all time) over 800 m, making him the favourite to win both middle distance gold medals at the European Championships in Split.
Split into simpler sentences: Later in the year, Elliott ran an outstanding 1:42.97 over 800m in Seville (ranking him No.1 in the world for 1990, and making him the third fastest Briton of all time over the distance). This made him the favourite to win both middle distance gold medals at the 1990 European Championships in Split.