  We prove that, given a certain isometric action of a two-dimensional Abelian
group A on a quaternionic K\"ahler manifold M which preserves a submanifold
N\subset M, the quotient M'=N/A has a natural K\"ahler structure. We verify
that the assumptions on the group action and on the submanifold N\subset M are
satisfied for a large class of examples obtained from the supergravity c-map.
In particular, we find that all quaternionic K\"ahler manifolds M in the image
of the c-map admit an integrable complex structure compatible with the
quaternionic structure, such that N\subset M is a complex submanifold. Finally,
we discuss how the existence of the K\"ahler structure on M' is required by the
consistency of spontaneous {\cal N}=2 to {\cal N}=1 supersymmetry breaking.
