Can LISA science be done from the ground with LIGO?
No. LISA and LIGO are complementary because they look at entirely different sources with different astrophysics. Observations by LIGO at frequencies between 10 and 1000 Hertz (oscillations per second) will reveal the mergers of neutron star binaries and stellar-mass black holes. Seismic activity and mass motions on the Earth prevent LIGO from looking at lower frequencies, and for heavier systems. By contrast, the much longer LISA baseline and the quietness of space allows LISA to work between 0.03 milliHertz and 1 Hertz, the band of gravitational-wave emission for the much more massive black holes found in galactic centers. Thus, LISA will give us new insight about the initial formation and growth of these black holes, as far as the edge of the observable Universe.
