en_tn_condensed/act/19/33.md

Alexander

This is the name of a man. (See: rc://en/ta/man/translate/translate-names)

motioned with his hand

You can make explicit that Alexander was showing the crowd that he wanted them to be quiet. AT: "gestured to the crowd to be quiet" (See: rc://en/ta/man/translate/figs-explicit)

to give an explanation

"wanting to explain"