Complex sentence: He achieved fame in the US after his performance at the Monterey Pop Festival in June 1967, and in 1968 his third and final studio album, "Electric Ladyland", reached number one in the US, spending two weeks at the top spot.
Split into simpler sentences: He achieved fame in the US after his performance at the Monterey Pop Festival later that year. In 1968, his third and final studio album, "Electric Ladyland", reached number one in the US, spending two weeks at the top spot.