en_tn/num/09/01.md

in the first month of the second year after they came out from the land of Egypt

This means that they had come out of Egypt a year earlier. They were beginning their second year in the wilderness. (See: rc://en/ta/man/translate/translate-ordinal)

in the first month

This is the first month of the Hebrew calendar. It marks when God brought the people of Israel out of Egypt. (See: rc://en/ta/man/translate/translate-hebrewmonths and rc://en/ta/man/translate/translate-ordinal)

after they came out from the land of Egypt

Here "they" refers to the people of Israel. The phrase "came out" means to leave. AT: "after they left the land of Egypt" (See: rc://en/ta/man/translate/figs-idiom)