Complex sentence: He achieved fame in the US after his performance at the Monterey Pop Festival in 1967, and in 1968 his third and final studio album, "Electric Ladyland", reached number one in the US.
Split into simpler sentences: He achieved fame in the US also and performed at the Monterey Pop Festival. In 1967, and in 1968 his third and final studio album, "Electric Ladyland", reached number one in the US.