Unlike Matisse and Rivera, who took a couple of decades to attain their mature styles, Dala's arrival came quick and early.
Dala didn't arrive slowly like Matisse and Rivera did. 
mnli hypothesis: Dala didn't arrive slowly like Matisse and Rivera did.  premise: Unlike Matisse and Rivera, who took a couple of decades to attain their mature styles, Dala's arrival came quick and early.