
personell
personnel-related
Refers to personnel, that is, the employees of an organization or company.
Das Unternehmen ist personell gut aufgestellt für die neuen Herausforderungen.
The company is well staffed for the new challenges.
personnel / personal
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personnel-related
Refers to personnel, that is, the employees of an organization or company.
Das Unternehmen ist personell gut aufgestellt für die neuen Herausforderungen.
The company is well staffed for the new challenges.

personal
Refers to an individual person and their individual matters or characteristics.
Die Entscheidung für den Umzug hatte rein personelle Gründe und war nicht beruflich bedingt.
The decision to move had purely personal reasons and was not job-related.
The German adjective 'personell' means 'relating to personnel'. It is often confused with the English noun 'personnel' (das Personal, die Belegschaft — the staff, workforce). So you cannot say 'das Personell der Firma'.
Wir müssen die Abteilung personell verstärken.
We need to reinforce the department in terms of staffing.
The word 'personell' (personnel-related) is derived directly from 'das Personal' (the staff/personnel). So it always describes a connection to the employees of a company or organization.
Es gab einige personelle Veränderungen in der Geschäftsführung.
There were some personnel changes in management.
In a business context, 'personell' (personnel-related) is often used in fixed combinations. Typical examples are 'personelle Ressourcen' (personnel resources), 'personelle Engpässe' (staffing shortages), or the statement that a department is 'personell unterbesetzt' (understaffed).
Wegen Krankheit gibt es bei uns gerade einen personellen Engpass.
Because of illness, we currently have a staffing shortage.
This rarer meaning is used to distinguish private motives from professional or factual ones. It is often found in the expression 'aus personellen Gründen' (for personal reasons).
Er hat den Job aus rein personellen Gründen abgelehnt.
He turned down the job for purely personal reasons.
personal / in person
Persönlich refers here to the private or individual affairs of a specific person. Personell, on the other hand, refers to the employees or staffing of an organization. Use persönlich for a private concern, and personell for questions about staffing levels or the distribution of responsibilities.

Im Gespräch mit der Chefin sprach Mia ein personelles Problem in ihrer Abteilung an.
During her conversation with the boss, Mia brought up a personnel-related problem in her department.
Im Gespräch mit der Chefin sprach Mia ein persönliches Problem an.
During her conversation with the boss, Mia brought up a personal problem.