Complex sentence: Kramer slips the picture he took of Profit in the bathroom into the letter as well, but in an affair involving a pizza delivery man, Jerry and Kramer conclude that it was actually Jerry's mohair sweater that caused Profit to sniff involuntarily.
Split into simpler sentences: Kramer slips the picture he took of Profit in the bathroom into the letter as well. But, in an affair involving a pizza delivery man, Jerry and Kramer conclude that it was actually Jerry's mohair sweater that caused Profit to sniff involuntarily.