Supplementary Data Simple, but not simplified: A new approach for optimising beyond-Standard Model physics searches at the Large Hadron Collider This record contains the full dataset generated for the study "Simple, but not simplified: A new approach for optimising beyond-Standard Model physics searches at the Large Hadron Collider". It contains the following files: data_cross_sections_full_exact.csv - a CSV file with the soft breaking parameters M1, M2, mu and tanb, the neutralino/chargino masses, the cross sections for neutralino-neutralino, chargino-neutralino and chargino-chargino production at the LHC operating at a CM energy of 13 TeV, and the branching ratios of the unstable charginos/neutralinos. benchmark_points.zip - this zip file contains the SLHA files for the four benchmark points as shown in the paper, together with the prospino output for the cross section.