The adjective in this sentence would be modifying the noun "arch" since the adjective (tall) is making the reader better understand certain characteristics of the arch.
Oftentimes, the idea of "conversion" is best explained as "<span>The process of cultural change brought about by immigration," since this can apply to wide variety of changes. </span>
Jean Baptiste Charbonneau was a Native American-French Canadian explorer, guide, fur trapper trader, and military scout during the Mexican American War.
You can also know him as the son of a Shoshone Indian known as Sacagawea, who guided and helped Lewis and Clark explore the Louisiana Territory.
I think it’s duke William