This exercise combines a single paradiddle with a five stroke roll. However, we're going to make a few modifications to both of those rudiments before putting them together.
Normally, in a paradiddle (RLRR LRLL), each four-note grouping begins with one accented note that is followed by three ghost notes. In this exercise, we will add a second accent on the second note of each grouping.
Then, in the second measure, we will transition into a five stroke roll (RLRLL), where the right notes are accented. The issue here is that you only have time to play three five stroke rolls in this measure so we're going to modify this pattern slightly but replacing the L at the end of the last five stroke roll with a RL. So in the end you get the following: RLRLL RLRLL RLRLRL.
Make sure to pay special attention to the accents. In the paradiddle measure, accents fall on the first and second notes of each grouping. In the five stroke roll measure, accents fall on the first and third notes. The thing that's especially challenging here is the transition from one rudiment and accent pattern to the other and back again.
Start slow and focus on:
Start at around 40 BPM and only increase speed when you can cleanly execute both the accented paradiddle and the five stroke roll measures. Pay special attention to the transition points between rudiments.