Complex sentence: These also include cooling menthol to help alleviate the difficulty getting to sleep in tropical climates, useful since the powder stays on the skin longer during sleep greatly increasing its effectiveness as well as treating the bacteria dispersed into bed linens.
Split into simpler sentences: These also include cooling menthol to help alleviate the difficulty getting to sleep in tropical climates. This is an effective application since the powder stays on the skin longer during sleep and treats the bacteria dispersed into bed linens.