Complex sentence: Throughout the series, Randy seems to always harbor crushes on Sharona and Natalie, writing a personal ad fitting Sharona in "Mr. Monk and the Paperboy", which he unsuccessfully tries to hide from her.
Split into simpler sentences: Throughout the series, Randy seems to always harbor crushes on Sharona and Natalie. As well, he wrote a personal ad fitting Sharona in "Mr. Monk and the Paperboy", which he unsuccessfully tries to hide from her.