It depends on the poster, the notes you displayed look like they should be played together...usually if they're single notes....the poster will let you know. Sometimes they have directions on the chord - note lingo, mine are as follows:
LH / RH = LEFT HAND / RIGHT HAND
[------] = SINGLE NOTES
- = WORDS TO THE SONG
CG / Bb_____FC / Eb = 2 CHORDS PLAYED RIGHT AFTER THE OTHER...
CG / Bb [F_G_Bb_D] = CHORD THEN SINGLE NOTES FOLLOW
[F_G_Bb_D] CG / Bb = SINGLE NOTES THEN CHORD PLAYED
HOPE THIS HELPED!