Complex sentence: In April 1975, Gary Dahl was in a bar in Bonny Doon listening to his friends complain about their pets, and this gave him the idea for the perfect "pet": a rock.
Split into simpler sentences: In April 1975, Gary Dahl was in a bar in Bonny Doon listening to his friends complain about their pets. This gave Dahl the idea for the perfect "pet": a rock.