The <e1>letter</e1> was sent from <e2>group</e2> to group of the dispersed believers to try and build them up "to encourage them" to fill them with hope.
The letter was sent
The letter was sent from group to group of the dispersed believers to try and build them up "to encourage them" to fill them with hope.
<triplet> letter <subject> group <object> Entity-Origin(e1,e2)