I agree, many charts for this song on the internet are just wrong. Here's the real chords in their simplest form -- which doesn't lose anything from the essence of the song.

The Dm and Am share a measure -- they're half a measure each, two beats each. Indicated by the line connecting them.
The other chords are one measure each, four beats each.


Intro:   F   C   F   C


Verse:
            _____
Bb F   C   Dm Am   G   D   D

C   C   G   Gm      D   A

Bb C   Bb C


To add most of the color from the original:
Change both F chords in the intro to Fmaj7.
Change both C chords in the intro to C11.
Change the first chord in the verse from Bb to Bbmaj7.
Change the A to A11.
Change the last chord in the verse from C to C11.

Great song, deserves to be played correctly.
Hope you find this helpful.