Complex sentence: The atomizers most commonly used nowadays are (spectroscopic) flames and electrothermal (graphite tube) atomizers, although other atomizers, such as glow-discharge atomization, hydride atomization, or cold-vapor atomization might be used for special purposes.
Split into simpler sentences: The atomizers most commonly used nowadays are (spectroscopic) flames and electrothermal (graphite tube) atomizers. Although other atomizers, such as glow-discharge atomization, hydride atomization, or cold-vapor atomization might be used for special purposes.