Education is the single most important factor in the development of a country. 

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Paraphrase: Change words. sentence structure- keep  meaning.

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Synonyms:  big vs large, 

Education: Academy, schooling, 

Most Important: significant, 

factors: aspect, elements, 

Country: nations, territory, 

Development: progression, evolution, advancement


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*Sentence Structure by below given way

Example:

Verbs> Nouns> adjectives

The most essential element of a nations development is education. 

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Concessions

**Although many would argue that the economy is the most important factor in nation building, I think education has a far greater impact.