Complex sentence: In series two, Golly thought his job was under threat when Archie MacDonald, one of Hector's two surviving sons and successor, announced the creation of the new post of Head Ranger, so he applied for the position to secure his place at Glenbogle.
Split into simpler sentences: In Series Two, Golly thought his job was under threat when Archie MacDonald, one of Hector's surviving son and successor, announced the creation of the new post of Head Ranger. Golly applied for the position to secure his place at Glenbogle.