Original sentence: Job shops machines are aggregated in shops by the nature of skills and technological processes involved, each shop therefore may contain different machines, which gives this production system processing flexibility, since jobs are not necessarily constrained to a single machine.Job shops typically move on to different jobs (possibly with different customers) when each job is completed
Edited sentence: Job shop machines are aggregated in shops by the nature of skills and technological processes involved, each shop therefore may contain different machines, which gives this production system processing flexibility, since jobs are not necessarily constrained to a single machine.Job shops typically move on to different jobs (possibly with different customers) when each job is completed; some of which are jobs they will never see again or may be repeat work that will be ordered over and over again on unknown timelines