The phrase "also expounds" is correct and usable in written English.
It can be used when you want to indicate that something further explains or elaborates on a topic that has already been mentioned.
Example: "The article discusses the main theories of evolution and also expounds on the implications of these theories for modern science."
Alternatives: "also elaborates" or "also explains".
Hughes also expounds at length, in prose riddled with typos, in support of Trevor Potter's proposed Anti-Corruption Act and other reform movements.
His brother-in-arms Thouless also expounds on the relationship between the growing population and economies of African countries and its wildlife.
He also expounds the extraordinarily modern aesthetic philosophy behind his glossy romances — "The surface isn't really the surface, but rather a manifestation of the depths" — and delivers a directorial credo: "Style is the most profound expression of personality".
Out in the morning!" The poet also expounds his "deeply felt conviction, the result of much observation in New York, Brooklyn, and other cities, that the only true and profitable way of reaching the morals of the young is through making them first healthy, clean-blooded and vigorous specimens of men".
The film also expounds the connection between homophobia and how male Holocaust victims are portrayed.
She also expounds on the racism baked into the Electoral College.
Its design principles are also expounded in detail.
He also expounded on family breakdown and the difficulties posed by an ageing population.
The producers also expounded more broadly on the vision and themes of the series.
Narboni also expounded and gave radical interpretations to certain conceptions that he understood as implied in the Guide.
He also expounded on his previously disclosed intention to become a designer — "not just clothing but water-bottle design, architecture, everything".
