General Information:

Here the word "us" refers to the writers of the letter Acts 15:22 but not its readers and so is exclusive. The word "you" is plural. (See: rc://en/ta/man/jit/figs-exclusive and rc://en/ta/man/jit/figs-you)

to lay upon you no greater burden than these necessary things

This speaks about laws that people need to obey as if they were objects that people carry on their shoulders. (See: rc://en/ta/man/jit/figs-metaphor)