I think that the chord on the left is played in the left hand and the notes on the right are played in the right hand all at the same time.
Left Hand / Right Hand
Key: F# or Gb
Gb-Bb-B-Eb/ (Gb), Ab, Bb, B, Db, Eb, F, Gb, Ab, Bb, B, Db, Eb, F, Gb, Ab
Ab-C-Db-F/ (Bb), Ab, Gb, F, Eb, Db, B, Bb
G-B-C-E/ (Ab), Gb, F, Eb, Db, B, Bb, Ab, Gb