The included dataset is from an magnetohydrodynamic simulation of a sunspot that is driven by photospheric motions. Several snapshots in time are extracted, and the magnetic field, velocity, and current from those snapshots is stored in the attached dataset, along with the three coordinate arrays. The datafiles are in HDF5 format, which is easily read in all major programming languages. The simulation is largely described in https://ui.adsabs.harvard.edu/abs/2017ApJ...851L..17K/abstract. The files are read directly from the restart files and the variables reside at their original grid locations. The files labeled fieldline.* are fortran unformatted datasets of magnetic field lines traced from the boundary of the simulation at these time steps. The dimensions of the traced field lines are 401x401x400x3.