sencillo
simple
sense
perception or understanding
+
-illo
diminutive suffix
Sencillo means simple. It can be remembered as something that makes sense0 (easy to understand0) with the Spanish diminutive1 suffix -illo1, implying it's reduced to its simplest form.
adjective
- simpleEasy to understand or do; not complicatedLa receta es muy sencilla de seguir. // The recipe is very simple to follow.