Complex sentence: Meanwhile, Krall coerces Ensign Syl to hand over the Abronath that she had kept hidden for Kirk, then dissolves her completely using the Abronath, the missing half of an ancient bioweapon that can disintegrate any humanoid.
Split into simpler sentences: Meanwhile, Krall coerces Ensign Syl to hand over the Abronath that she had kept hidden for Kirk, then dissolves her completely. The Abronath is the missing half of an ancient bioweapon, which can disintegrate any humanoid.