Complex sentence: The screenplay was adapted by Douglas Kenney, Chris Miller and Harold Ramis from stories written by Miller and published in "National Lampoon" magazine based on Miller's experiences in the Alpha Delta Phi fraternity at Dartmouth College.
Split into simpler sentences: The screenplay was adapted by Douglas Kenney, Chris Miller and Harold Ramis from stories that were written by Miller and published in "National Lampoon" magazine. The stories were based on Miller's experiences in the Alpha Delta Phi fraternity at Dartmouth College.