Complex sentence: "Grenade" is a pop and R&B ballad, co-written by Mars with songwriting-production team The Smeezingtons, Brody Brown, Claude Kelly, and Andrew Wyatt.
Split into simpler sentences: Grenade is a pop and R&B ballad. It was written by Bruno Mars and his production team The Smeezingtons, along with Brody Brown, Claude Kelly, and Andrew Wyatt.