The form
One bar carries two chords. The transcription writes both chords' notes together without saying which note belongs to which, so that bar is printed and not drawn — a keyboard guessed from an ambiguous line would show a chord nobody plays.
The hands
Left hand then right, as the source writes them. A pianist's voicing routinely carries a colour the chord symbol does not spell — a flat ninth over a dominant, a ninth on top of a seventh chord — so the notes printed under each keyboard are what is actually played, rather than what the symbol alone would predict.
Bbmaj7
bar 1
LH D3 A3RH F4 C5 E5
Rootless A voicing
Fm7
bar 2
LH Ab3 Eb4RH C5 F5 Ab5
Bb7
bar 3
LH D3 Ab3RH F4 Bb4 Db5
Ebmaj7
bar 4
LH G3 D4RH Bb4 F5 A5
Eb7
bar 5
LH G3 Db4RH Bb4 Eb5 Gb5
Edim7
bar 6
LH G3 Db4RH Bb4 E5 G5
Bbmaj7
bar 7
LH D3 A3RH F4 C5 E5
Dm7
bar 9
LH F3 C4RH A4 E5 G5
G7
bar 10
LH B3 F4RH D5 A5 C6
Cm7
bar 11
LH Eb3 Bb3RH G4 D5 F5
F7
bar 12
LH A3 Eb4RH C5 G5 Bb5