Engaging with a new culture helps people expand their knowledge of other cultures, in addition discovering new cuisines gives them a deep insight into thate country'ies eating habits and finally foreign travels, travelling abroad offerds the opportunity to encounter with people from different ethnicities.

Travelling abroad has a significant impact on the individuals.

"individuals" or "an individual" works better here because it's talking about any group, not a specific one.

Engaging with a new culture helps people expand their knowledge of other cultures, i. In addition, discovering new cuisines gives them a deep insight into that country's eating habits and f. Finally, foreign travels offerds the opportunity to encounter with people ofrom different ethnicities.

This is a really long sentence, so I cut it into 3. The markers I used to separate them were the transition words "finally" and "in addition."