Public transit in Stord and Bømlo in Norway

Three of us travelers will be in Bergen, Norway without car, relying entirely on public transit. We would like to make it to Stord and/or Bømlo (ideally Svortland) in the Sunnhordland islands, for a few days.
What public transit companies operate routes between Bergen and either of these islands? Once on the islands, what public transit can be used to get around? --so that I can come prepared with printouts of timetables? (Holy grail: is there an integrated transit website I can use to plan the journey?)
I don't speak Norwegian so haven't succeeded in figuring this out through internet searches. In addition Google Maps shows no transit route between the cities.
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1. Introduction (for 1.258J Public Transportation Systems, Spring 2017)
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