Complex sentence: Players can adjust the string pitches by moving the white bridges in the picture before playing, and use three finger picks, otherwise known as plectra (on thumb, index finger, and middle finger), to pluck the strings.
Split into simpler sentences: Players can adjust the string pitches by moving the white bridges before playing. To play the instrument, the strings are plucked using three finger picks, otherwise known as plectra (on thumb, index finger, and middle finger), to pluck the strings.