NET
2 that during a severe ordeal of suffering, their abundant joy and their extreme poverty have overflowed in the wealth of their generosity.
Darby
2 that in a great trial of affliction the abundance of their joy and their deep poverty has abounded to the riches of their [free-hearted] liberality.
KJV
2 How that in a great trial of affliction the abundance of their joy and their deep poverty abounded unto the riches of their liberality.