Committed/performed/made a selfish act

[Xinfu]

Are my sentences grammatical?

-Invasion is often said to be bad, but is not always so. For example, the British committed/performed/made a selfish act of invading this country, but before retreating/going back/receding to their own country, they gave democracy to people/ the people of this country, overseeing/ensuring that elections were made/held/undertaken in a peaceful and fluent manner. If the British had not invaded this country, it might still be living in the dark, with warlords fighting/jostling with each other for power. An act started with a bad intention/bad intentions was made/turned good in the end.

[poli]

Are my sentences grammatical?

-Invasion is often said to be bad, but is not always so. For example, the British committed:good:/performed:good:/made:bad: the selfish act of invading this country, but before retreating:good:/going back:good:/receding:bad: to their own country, they gave (brought is better than gave) democracy to people:bad:/ the people:good: of this country, overseeing:bad:/ensuring that elections were made:bad:/held:good:/undertaken:good: in a peaceful and fluent:bad: efficient manner. If the British had not invaded this country, we might still be living in the dark, with warlords fighting:good:/jostling:good: with each other for power. An act started with a bad intention:good:/bad intentions:good::thumbsup: was made:good:/turned out good :good:in the end.
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[Tomisimo]

I might also say "An act that started with bad intentions..."