Complex sentence: From 1905 to 1911 he and his son Bridge Nichols practiced together as Nichols & Son and from 1913 to 1915 John and his brother Leo Morton Nichols were in business together as Nichols & Nichols.
Split into simpler sentences: From 1905 to 1911 he and his son Bridge Nichols practiced together as Nichols & Son. From 1913 to 1915 John and his brother Leo Morton Nichols were in business together as Nichols & Nichols.