Complex sentence: Before joining the late night comedy show SNL, Samberg was a YouTube and internet star who first began making comedy videos with his two friends Akiva Schaffer and Jorma Taccone.
Split into simpler sentences: Before joining the late night comedy show SNL, Samberg was a YouTube and Internet star. He first began making comedy videos with his two friends Akiva Schaffer and Jorma Taccone.