What are the complications associated with delivery multiples?

Several. Prematurity, bleeding, risk of c-section are probably the top few.
Many risks. Risk to infants: prematurity, cerebral palsy, learning disabilities, behavioral difficulties, chronic lung disease, developmental delay, death risk to mother: hypertension, preeclampsia, gestational diabetes, postpartum hemorrhage risk to family: maternal depression, child abuse, divorce social risk: incrased health care expenditures.