Complex sentence: While the precise lineage of the instrument is still unclear, historians believe that the guitar is the descendant of the Greek kithara, gittern, lyre, European and Middle Eastern lutes, and the Spanish vihuela.
Split into simpler sentences: While the precise lineage of the instrument is still unclear, historians believe that the guitar is the descendant of several ancient instruments. These ancient instruments from which the guitar has evolved include the Greek kithara, gittern, lyre, European and Middle Eastern lutes, and the Spanish vihuela.