Bilhah ... conceived again
"Bilhah ... became pregnant again"
bore Jacob a second son
"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" (See: rc://en/ta/man/translate/figs-idiom and rc://en/ta/man/translate/figs-metaphor)
"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.'"