Complex sentence: She returned to the contest again in Melodifestivalen 2003 with "Hela världen för mig" finishing fifth, and again in Melodifestivalen 2005 with "Du och jag mot världen", this time as a duet with Fredrik Kempe, which finishing eighth.
Split into simpler sentences: She returned to the contest again in 2003 with "Hela världen för mig" finishing fifth. After a one-year break, Nielsen returned again in Melodifestivalen 2005 with "Du och jag mot världen", this time as a duet with Fredrik Kempe, which finishing eighth.