Leaving the responsibility for exact details to the compiler, while devoting our effort to arriving at the outlines of the condensation: The compiler refers to Jason, the original author. Good News Bible states the meaning of this verse neatly and provides an excellent model. Another possible model is:

• I have merely summarized the main events included in Jason’s account [similarly Contemporary English Version].

Quoted with permission from Bullard, Roger A. and Hatton, Howard A. A Handbook on 1-2 Maccabees. (UBS Helps for Translators). New York: UBS, 2011. For this and other handbooks for translators see here.