19. As well as (with a similar meaning to 'not only... but also') is normally followed by an -ing form.
As well as breaking his leg, he hurt his arm. (NOT As well as ̶h̶e̶ ̶b̶r̶o̶k̶e̶ his leg...)
He works full time as well as bringing up three children.
For more details, see Practical English Usage Third Edition 78.