How did Franz Schubert expand the number of themes and key centers in sonata-form movements?

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Franz Schubert expanded the traditional sonata-form structure by modifying the exposition, which typically relied on two themes and two tonal centers. In his later instrumental works, he frequently increased the number of both basic themes and central keys from two to three.1

This expansion significantly influenced the Austro-German symphonic tradition, serving as a direct precursor to the three-thematic-group expositions found in the works of Anton Bruckner and the expansive sonata structures of Gustav Mahler.1