Where does “sencillito” come from?

sencillito (Spanish) comes from Spanish sencillo, from Old Spanish senziello, from Vulgar Latin singellus, from Latin singulus, from Proto-Italic sem-g-lo-, from Proto-Indo-European sem- — together, one.

Ancestry of “sencillito”, step by step

Step	Language	Word	Meaning
1	Spanish	sencillo	plain; simple, straightforward; single
2	Old Spanish	senziello	—
3	Vulgar Latin	singellus	—
4	Latin	singulus	single; apiece; every
5	Proto-Italic	sem-g-lo-	—
6	Proto-Indo-European	sem-	together, one

Every word from Proto-Indo-European sem- →Every word from Proto-Italic sem-g-lo- →Every word from Latin singulus →