Complex sentence: It is used by a number of German cities, in Krakow, Poland, and has been selected to replace current heritage trams used by the Glenelg Tram in Adelaide, Australia due to low maintenance requirements; this variant will have vigilance controls.
Split into simpler sentences: It is used by a number of German cities, in Krakow, Poland, and replaced heritage trams used by the Glenelg Tram in Adelaide, Australia. Due to low maintenance requirements; this variant will have vigilance controls.