Read two output files at the same time

Hello, is there any ways to read 2 output files after simulation in LAMMPS, and then put these two files together to get a larger model as an input file?
For example, one electrolyte part is minimized first and then saved as file, and one electrode part is also minimized to get the file. After that, can I read these two files in the same time to get a structure composed of this electrode and electrolyte? electrode at the bottom and electrolyte on the top

See documentation for read_data and the add keyword.

Thank u