Complex sentence: The greatest league success still remains second place in the 1965 and 1973 seasons and the club also came close in the Czechoslovakian Cup, losing twice in 1966 and 1992 finals.
Split into simpler sentences: The greatest league success was the second place in the 1965 and 1973 seasons. The club also came close in the Czechoslovakian Cup, losing twice in 1966 and 1992 finals.