Having the figures in the public domain will seriously complicate any attempt to rig the vote.

The campaign group's federal structure complicates his attempts to remove them.

Don't complicate his attempts to put things right.

Several definitional issues complicate attempts to determine the incidence of open marriage.

The strains may also complicate attempts to develop a vaccine, and the mutation of the cancer may mean that it could spread to other related species, like the quoll.