Complex sentence: In 1912 he was a singles runner-up for the Biarritz Golf Club tournament, losing to Rahe; however, he was still successful in doubles, winning the inaugural Russian Championships doubles pairing with home favorite Mikhail Sumarokov-Elston.
Split into simpler sentences: In 1912 he was a singlesrunner-up for the Biarritz Golf Club tournament where he lost to Rahe. Although he was still successful in doubles as he won the inaugural Russian Championships doubles pairing with home favorite Mikhail Sumarokov-Elston.