Now-a-days(Nowadays,) the unfashionable thought of ...
Though(However) , I agree to the statement, but it has both pro's and con's(pros and cons) which is one of the most debatable topic.
... options to develop career(comma) such as public sector and private sector.
... that their worker's(workers) should work only with the signed organization as many people familiarized earlier, but ...
(According to this, I would argue that) I agree to this idea of working to reach one's goals.
Nevertheless, instead of choosing several careers, it is better to stick to the single career and can(be more sophisticated)sophisticate the individual and organizational(in their) development. In addition, single jobs can be pleasant and (more) focused whereas multi jobs are more stress full(stressful) , which ultimately not beneficial to(and do not be followed by benefits for) anyone's life.
Finally I opine(would state) that,(without comma) approximately 50% of current ...
To conclude, choosing single or several career is totally depends(depended) ] on an individual idea of earning money