Complex sentence: He eventually became disenchanted with acting after spending several years out of work and living on social security payments and began writing screenplays and was soon commissioned by David Puttnam to write the screenplay for "The Killing Fields" (1984).
Split into simpler sentences: He eventually became disenchanted with acting after spending several years out of work and living on social security payments and began writing screenplays. He was soon commissioned by David Puttnam to write the screenplay for "The Killing Fields" (1984).