Complex sentence: Instead of the photographer saying "cheese", he says "peas" (due to Howie, who was before Ramona, pointing it out to the photographer), causing Ramona to interrupt with a great big "Ew!" ruining her portrait.
Split into simpler sentences: Instead of the photographer saying "cheese", he says "peas". Causing Ramona to interrupt with a great big "Ew!" ruining her portrait.