Given the task definition and input, reply with output. Given a text, write a compressed version of it in a single sentence.

Yet line-balancing problems bedeviled SLS operations. Laying out a production line required exact calculation of the number of workers required for a given step to keep single garments moving through the operation continuously-much as a car moves down an assembly line.
Yet problems bedeviled SLS operations. Laying out a production line required exact calculation of the number of worker required to keep single garments moving continuously-much as a car assembly line.