Complex sentence: However, Kerrigan emitted psionic energy calling Jim Raynor and Arcturus Mengsk, also gathering the attention of the Protoss-specifically Tassadar and Zeratul.
Split into simpler sentences: However, Kerrigan emitted psionic energy, calling Jim Raynor and Arcturus Mengsk. This also gathered the attention of the Protoss--specifically Tassadar and Zeratul.