another of fibonacci's books is practica geometriae written in 1220 which is dedicated to dominicus hispanus whom we mentioned above.

How would the previous sentence be correctly capitalized?
Answer: Another of Fibonacci's books is Practica geometriae written in 1220 which is dedicated to Dominicus Hispanus whom we mentioned above.
zellgeist are specialist of optimizing the sales performance incl. design and processes as well as motivation and seminars for management and employees.

How would the previous sentence be correctly capitalized?
Answer: Zellgeist are specialist of optimizing the sales performance incl. design and processes as well as motivation and seminars for management and employees.
three mondays ago, we got a resume from a guy down in orlando named lewis vance.

How would the previous sentence be correctly capitalized?
Answer: Three Mondays ago, we got a resume from a guy down in Orlando named Lewis Vance.
a child soldier is a child who is under 18 and who are directly or indirectly involved in an armed conflict as part of an armed group.

How would the previous sentence be correctly capitalized?
Answer: A child soldier is a child who is under 18 and who are directly or indirectly involved in an armed conflict as part of an armed group.