It’s a Sin to Tell a Lie by Billy Mayhew is a big ukulele favourite so there are a ton of versions around. I the Asylum Street Spankers’ version because it’s a real education in chord inversions. You’re going to have to be on the ball to keep up.
Christina Marrs is using D-tuning for this but I’ve stuck with C-tuning (using similar chord shapes). That means it’s played high up the neck so pay attention to the fret numbers in the chord charts.
Here’s a much simpler version of the chords. It’s in the same key so mix and match between them as you see fit.
I recommend starting by learning the simple version then gradually adding in elements you like from the difficult version.
Also, take a look at the Ukulele Boudoir version which is in the same key and take elements of that you enjoy.
Other than the one-strum-per-chord into this should get you most of the way through:
d – d – d u d u