Q:

They first sun - dried the garbage for one to three days to bring down the moisture level. 

• 1
  The moisture level was brought down by sun - drying the garbage for one to three days .
• 2
  One to three days of sun - drying brought down the moisture level of the garbage
• 3
  The moisture level of the garbage came down when it was sun - dried for one to three days
• 4
  The garbage was first sun - dried for one to three days to bring down the moisture level