Complex sentence: Sir Thomas Shenton Whitelegge Thomas, GCMG, GCStJ (known as Sir Shenton Thomas) was the last Governor of the Straits Settlements, 1934--1942 during which time World War II began.
Split into simpler sentences: Sir Thomas Shenton Whitelegge Thomas, GCMG, GCStJ, commonly known as Sir Shenton Thomas, was the last Governor of the Straits Settlements. He served from 1934 to 1942 during which time World War II began.