Complex sentence: Its heyday in Europe was from the mid- 18th to mid- 19th century, at which time it was replaced in most bands by the glockenspiel, which was carried similarly but could be played musically.
Split into simpler sentences: Its heyday in Europe was from the mid- 18th to mid- 19th century. In the mid- 19th century it was replaced in most bands by the glockenspiel, which was carried similarly but could be played musically.