This little awk snippet wraps textlines longer than 80 characters and prepends a single blank to the wrapped content.

awk '{textlength=int(length($0)/70) ; i=1 ; \
if (length($0)>72) { \
  { print substr($0,0,70) } \
    while (i< =textlength) { { print " " substr($0,i*70+1,70) } i=i+1} \
} else { \
  { print ($0) } } }' inputfile > outputfile