Complex sentence: In 2000, Fredriksson released a "greatest hits" compilation called "Äntligen" ("At Last"), which went on to be a big seller in Sweden, peaking at No.1 for three weeks.
Split into simpler sentences: In 2000, Fredriksson released "Äntligen" ("At Last"). The greatest-hits compilation, titled after one of her songs, went on to be a big seller in Sweden, peaking at No.1 for three weeks.