Complex sentence: When Mark calls House takes off, but not before putting up the toilet seat to make Stacy believe that Mark left it up, one of Stacy's pet peeves that House learned from her psych file.
Split into simpler sentences: When Mark calls House takes off, but not before putting up the toilet seat to make Stacy believe that Mark left it up. One of Stacy's pet peeves that House learned from her psych file.