Exegesis:

kai egeneto ‘and it happened,’ cf. on 1.8.

en tō poreuesthai eis Ierousalēm lit. ‘during the journeying to Jerusalem.’ The subject of poreuesthai may be ‘they,’ i.e. Jesus and his disciples, or ‘he,’ i.e. Jesus. The latter is preferable because no reference is made to the disciples in the subsequent story.

kai autos diērcheto dia meson Samareias kai Galilaias ‘he passed between Samaria and Galilee.’ kai autos is here not emphatic. For dierchomai cf. on 2.15. dia meson with following genitive is very awkward. Here it may mean either ‘through the midst of,’ or ‘between,’ i.e. ‘through the borderlands’ of Samaria and Galilee, preferably the latter.

Translation:

On the way to Jerusalem, or, ‘on his journey to J.,’ ‘while he was travelling to J.,’ cf. 9.51 and 13.22.

Quoted with permission from Reiling, J. and Swellengrebel, J.L. A Handbook on the Gospel of Luke. (UBS Handbook Series). New York: UBS, 1971. For this and other handbooks for translators see here . Make sure to also consult the Handbook on the Gospel of Mark for parallel or similar verses.