Complex sentence: Flip's origins are said to have rooted from "Night" a 1930 Silly Symphony that Ub Iwerks animated while working for his colleague and friend Walt Disney in 1930.
Split into simpler sentences: Flip's origins are said to have been rooted in the Silly Symphony cartoon, "Night". The short was animated by Ub Iwerks while working for his colleague and friend Walt Disney in 1930.