Simple and simplistic are not the same…

While being closely related with the same root word, today’s pair of words are quite different – and understanding them can be quite enlightening. 

simple [adjective]: basic; missing elaboration, ostentation, complication and subdivisions
Basic arithmetic is simple to write and calculate; quadratic equations are not so simple!
Following main roads is simpler than maneuvering through side streets.

In grammatical terms, simple means having only one clause without any subordinate clauses or modifiers.

simplistic [adjective]: over simplified, missing information or depth
Saying income is the indicator of career success is simplistic.