Complex sentence: The IBM 5100 could be configured with up to 32 kB of Executable ROS (ROM) and up to 64 kB of RAM, so a simple bank switching scheme was used to extend the address space.
Split into simpler sentences: The IBM 5100 could be configured with up to 32 kB of Executable ROS (ROM) and up to 64 kB of RAM. A simple bank switching scheme was used to extend the address space.