Complex sentence: He joined Angyalföldi Dixieland Zenekar orchestra in 1963 and from 1969 onwards, he worked for two decades as band composer-arranger including from 1969 with Magyar Rádió (Hungarian Radio).
Split into simpler sentences: He joined Angyalföldi Dixieland Zenekar orchestra in 1963 and from 1969 onwards, he worked for two decades as band composer-arranger. In 1969, he worked with Magyar Rádió (Hungarian Radio).