Original sentence: In 1906 he was promoted to the position of Acting Supervisor and was in charge of the  San Bernardino Forest Reserve and the San Gabriel Timberland Reserve, which was the first federal reserve in the state
Edited sentence: In 1906 he was promoted to the position of Acting Supervisor and was in charge of the  San Bernardino Forest Reserve and the San Gabriel Timberland Reserve.The San Gabriel Reserve was the first federal reserve established in the state