Piece together
Definition 1 of 2
Pro Tip 1/3Context Clues
Use surrounding words and sentences to understand 'piece together' in complex scenarios. 
Detectives had to piece together clues from various testimonies.
Pro Tip 2/3Analytical Process
'Piece together' implies a careful, often slow, process of understanding or solving something. 
It took hours to piece together the sequence of the system failure.
Pro Tip 3/3Incomplete Information
It's used when you have partial information and are trying to get a full picture. 
We're still piecing together reports from the incident.