Original

Edited

Moreover, border trade is a key supporting the economy of Thailand era that directly influence to the economic development especially in Bangkok including urban and other provinces in Thailand.

Border trade is important for the Thai economy and directly influences development in Bangkok and other areas of the country.

Because:

1. No need for the ‘connection’ word to begin the sentence.
2. Thailand is used twice.
3. Economic is used twice.
4. Word reduction from 29 to 20, 31%
5. No meaning is lost.