Past Simple:

She studied abroad for two years before returning home.The team won the championship last season.I visited my grandparents last summer and stayed with them for a week.He worked as a teacher for five years before changing careers.We traveled to Europe for our honeymoon and visited several countries.The company invested in new technology and saw a significant increase in profits.I bought a new car last month and it has been running smoothly since then.She completed her degree in business management and graduated with honors.They renovated their house last year and it now looks brand new.He lost his job last winter, but quickly found a new position at a different company.

Present Perfect:

I have lived in this city for over five years.She has never been to Asia before this trip.We have just finished renovating our kitchen.They have already seen this movie three times.He has finally completed his novel after years of writing.I have already eaten dinner, so I'm not hungry.The company has recently hired a new CEO.She has traveled to over 20 countries in her lifetime.We have never tried sushi before today.He has been working on this project for weeks and it is finally done.