Kat Bein of Billboard wrote that the song has 'straightforward melodies, easy beats, and a good, clear vocal', and felt that there is 'nothing flashy about this future bass drop'. The song is described as an 'irrefutably stylistic party anthem track that is sure to make a statement on the charts'. On 25 July 2017, the duo shared a teaser via Epic Amsterdam, revealing the track's details and release date. On 23 July 2017, Dimitri Vegas & Like Mike and David Guetta made their live performance debut of the song in Ibiza. On 14 July 2017, Dimitri Vegas posted a photo of himself and David Guetta, captioned 'Big things coming'. The song was released on 28 July 2017 via Smash the House. It was composed and produced by Angemi Antonino, David Guetta and Dimitri Vegas & Like Mike, with lyrics written by Hailey Collier, Peter Hanna, Kiiara and Ethan Roberts. ' Complicated' is a song by Belgian DJ and record producer duo Dimitri Vegas & Like Mike and French DJ and record producer David Guetta, featuring American singer-songwriter Kiiara. Dimitri Vegas & Like Mike singles chronology
