Complex sentence: Karl kissed his beautiful secretary Sarah Beaumont in 1998 and when Susan eventually found out through neighbourhood gossip their marriage suffered an all time low after she slapped him following Ruth and Phil Martin's wedding.
Split into simpler sentences: Karl kissed his beautiful secretary Sarah Beaumont in 1998. When Susan eventually found out through neighbourhood gossip, their marriage suffered an all-time low, after she slapped him following Ruth and Phil Martin's wedding.