Complex sentence: It became clear that Stone was only being protective of Emma by not letting her in his'gang', however, Emma's determination to prove herself led her to getting killed in an explosion after trying to save others, despite orders to evacuate the building.
Split into simpler sentences: It became clear that Stone was only being protective of Emma by not letting her in his'gang'. However, Emma's determination to prove herself led her to getting killed in an explosion, after trying to save others, despite orders to evacuate the building.