Complex sentence: His son Algot Törneman, b.1909, later became an artist in his own right, and it was he who Törneman pictured in his 1921 painting "Algot med teddybjörn" (Algot with teddybear).
Split into simpler sentences: His son Algot Törneman, b.1909, later became an artist in his own right. It has he who Törneman pictured in his 1921 painting "Algot med teddybjörn" (Algot with teddybear).