Complex sentence: His best result was a second place at the Detroit Grand Prix, de Angelis was the only driver to finish in the top 5 in 1984 not to score a race win, showing his consistent performances throughout the season with the improving Lotus-Renault.
Split into simpler sentences: His best result was a second place at the Detroit Grand Prix. De Angelis was the only driver to finish in the top 5 in 1984 not to score a race win, showing his consistent performances throughout the season with the improving Lotus-Renault.