Complex sentence: The theatrical author Görel Garlick gives a period of around three years as being a likely timeframe, which would seem probable as by 1871 Matcham was back in Torquay and under the guidance of Bridgeman, this time as his chief assistant.
Split into simpler sentences: The theatrical author Görel Garlick gives a period of three years as being a likely time frame. This would seem likely as by 1871 Matcham was back in Torquay and under the guidance of Bridgeman, this time as his chief assistant.