#Bilhah ... conceived again

"Bilhah ... became pregnant again"

#and bore Jacob a second son

"and gave birth to a second son for Jacob"

#With mighty wrestlings have I wrestled with my sister

The phrase "wrestlings have I wrestled" is an idiom used for emphasis. It is also a metaphor that speaks of Rachel's attempts to have a child like her sister as if she were having a physical fight with Leah. AT: "I have had a great struggle to have children like my older sister, Leah" (UDB) (See: [[:en:ta:vol1:translate:figs_idiom]] and [[:en:ta:vol1:translate:figs_metaphor]])

#and have prevailed

"and I have won" or "I have succeeded"

#called his name Naphtali

Translators may also add a footnote that says "The name Naphtali means 'my struggle.'"