Complex sentence: IADL is similar to Dysfunctional Family Circus in its operation, except that instead of using "Family Circus" cartoons, readers were invited to submit captions for a series of random photographs.
Split into simpler sentences: IADL is similar to Dysfunctional Family Circus in its operation. Instead of "Family Circus" cartoons, readers were invited to submit captions for a series of random photographs.