Complex sentence: Software interrupt instructions can also function similarly to subroutine calls and be used for a variety of purposes, such as to request services from device drivers, like interrupts sent to and from a disk controller to request reading or writing of data to and from the disk.
Split into simpler sentences: Software interrupt instructions function similarly to subroutine calls and are used for a variety of purposes, such as to request services from low-level system software such as device drivers. For example, computers often use software interrupt instructions to communicate with the disk controller to request reading or writing of data from and to the disk.