Complex sentence: In the mid 1930s Tenni ventured into car racing, and in 1936 and 1937 drove for Maserati, but was not as successful as on two wheels although, he did compete in the 1936 Mille Miglia, finishing first in his class and fifth overall.
Split into simpler sentences: In the mid 1930s Tenni ventured into car racing, and in 1936 and 1937 drove for Maserati, but was not as successful as on two wheels. He competed in the 1936 Mille Miglia finishing first in his class and fifth overall.