Complex sentence: To help raise the mattress's height, thus making it easier to get in and out of bed; to help absorb shock and reduce wear to the mattress; and to help create a perfectly flat and firm structure for the mattress to lay upon.
Split into simpler sentences: To help raise the mattress's height, thus making it easier to get in and out of bed. And to help create a perfectly flat and firm structure for the mattress to lay upon.