How do you say this in Spanish?
"Spanish is a fun language to learn, also it is important in business. Many people speak Spanish in the world, it's almost a necessity to learn it if you want to work in business, just like French"

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Of course, the original is fine if you work for The Department of Redundancy Department, or the American Dodgeball Association of America.

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First of all, the English is grammatically correct but a little awkward,
"Spanish is a fun language to learn. Many people in the world speak Spanish. Like French, it is almost a necessity if you want to work in business."

In the original, you said almost the same thing about business twice, and repeating "to learn" was unnecessary.

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Aprender Español es muy divertido, también es importante en los negocios. Muchas personas hablan español en el mundo, es casi necesario aprenderlo si quieres trabajar haciendo negocios, igual que el Francés

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"Spanish is a fun language to learn, also it is important in business. Many people speak Spanish in the world, it's almost a necessity to learn it if you want to work in business, just like French"

Aprender español es muy divertido, y también, es importante para hacer negocios. Muchas personas en el mundo lo hablan, es casi una necesidad aprender español para trabajar haciendo negocios, asi como sucede con el francés.

REF.: I'm a Certified Spanish Teacher.