Complex sentence: Physically Nimrod is categorized in the "Official Handbook of the Marvel Universe" as possessing "Class 100" strength because Nimrod could engage the Juggernaut in hand-to-hand combat.
Split into simpler sentences: Physically Nimrod is categorized in the "Official Handbook of the Marvel Universe" as possessing "Class 100" strength. This level is stated due to the fact that Nimrod could engage the Juggernaut in hand-to-hand combat.