Complex sentence: Stafford himself continued to record, but had no more hits, although his 1973 release/joint composition, "Amarillo by Morning", was later covered by George Strait on Strait's 1982 album "Strait from the Heart".
Split into simpler sentences: Stafford himself continued to record, but had no more hits. His 1973 release/joint composition, "Amarillo by Morning" was later covered by George Strait on Strait's 1982 album "Strait from the Heart".