# Yes, it was their good pleasure

"The believers in Macedonia and Achaia were pleased to do it"

# and they owe it to them

"and the people of Macedonia and Achaia owe it to God's people in Jerusalem" 

# if the Gentiles have shared in their spiritual things

"since the Gentiles have shared in the spiritual things of the Jerusalem believers"

# minister to them

The word "minister" here means to serve in a formal way, much like the priests offered sacrifices in the temple.

# with their material things

"by giving them material things"