Complex sentence: Starscream, having been humiliated at the hands of Megatron, infiltrates Shockwave's towers and sabotages his lab equipment, in the lab he finds Grimlock being held prisoner.
Split into simpler sentences: Starscream, having been humiliated at the hands of Megatron, infiltrates Shockwave's towers and sabotages his lab equipment. In the lab he finds Grimlock being held prisoner.