Complex sentence: A software requirements specification (SRS) is a description of a software system to be developed, laying out functional and non-functional requirements, and may include a set of use cases that describe interactions the users will have with the software.
Split into simpler sentences: A software requirements specification (SRS) is a description of a software system to be developed, laying out functional and non-functional requirements. The specification may include a set of use cases that describe interactions the users will have with the software.