Complex sentence: Circumcision, reserved for the priests, is done when the boy is one week old, and with 13 years his pubic hair may be trimmed in a special ceremony where only Male Elders are there.
Split into simpler sentences: Circumcision, reserved for the priests, is done when the boy is one week old. At the age of 13 years his pubic hair may be trimmed in a special ceremony where only Male Elders are there.