Original: His music was influenced by both Brazilian folk music and by stylistic elements from the European classical tradition, as exemplified by his Bachianas Brasileiras ("Brazilian Bachian-pieces").
Simplified: His music was influenced by both Brazilian folk music and by classical music from Europe. The music of Johann Sebastian Bach was especially important for him, and he composed several pieces called Bachianas brasileiras by which he meant: Brazilian music in the style of Bach.