What section of the sonata form movement did Beethoven greatly expanded and made it dramatic?

Beethoven greatly expanded the development section of the sonata form movement, infusing it with heightened drama and emotional depth. He utilized complex modulations, thematic transformation, and intense contrasts to create a sense of conflict and tension. This innovation not only showcased his compositional prowess but also set the stage for future composers to explore more elaborate and expressive developmental techniques. Through this expansion, Beethoven transformed the sonata form into a more narrative and dynamic structure.