Complex sentence: In 1971--1972, he decided to undergo a test inspired by the aphorism "I've never seen colors fighting each other" by Picasso and painted some watercolors and later some figurative etchings employing contrasting and harsh colors and signed them with the pseudonym of ANTIGONE.
Split into simpler sentences: In 1971--1972, he decided to undergo a test inspired by the aphorism "I've never seen colors fighting each other" by Picasso. He painted watercolors and figurative etchings, employing contrasting and harsh colors and signed them with the pseudonym of ANTIGONE.