What does transitioning people from one job to another entail? During the transition period, what type (s) of unemployment would describe these people?

"Transitioning people from one job to another" means that people who suffer from structural unemployment acquire the necessary skills to find a new job.

Structural unemployment happens when an unemployed individual cannot get a job because he/she lacks the skills required by the employer to fill that job opening. When this individual receives training and acquires the necessary skills, it is said that he/she transitioned from one job to another.