This song can be simplified down to just Bb, four basic chords: Eb
Gm, and Cm (or G, Em, C and Am if you’re looking at the un-capo’d shapes). However, there are a few variations. The 7ths and 9ths give a little ‘prettiness’ to the sound of the basic chords, usually achieved simply by placing a finger here or there. You’ll also see one or two ‘sus’ chords, which are used briefly in order to add movement to the progression.