Complex sentence: It was replaced by the current Poljud Stadion in 1979, although it has at times been used by Hajduk for matches since 1979, including a game against CS Grevenmacher in the 1997--98 UEFA Cup.
Split into simpler sentences: It was replaced by the current Poljud Stadion in 1979. It has at times been used by Hajduk for matches since 1979, including a game against CS Grevenmacher in the 1997--98 UEFA Cup.