Complex sentence: Boon Mark Gittisarn was born on September 1,1898 in Ratchaburi province in Thailand and in 1921, he completed his secondary education at Bangkok Christian College, where he had made a profession of faith in Jesus Christ.
Split into simpler sentences: Boon Mark Gittisarn was born on September 1,1898, in Ratchaburi province in Thailand. In 1921, he completed his secondary education at Bangkok Christian College, where he had made a profession of faith in Jesus Christ.