Complex sentence: In 1936, Ross started his career working as a mail boy for Humble Oil in Midland, Texas, the epicenter of the oil boom where he married Virginia Louise Elkin of the well-established Midland family in 1941.
Split into simpler sentences: In 1936, Ross started his career working as a mail boy for Humble Oil in Midland, Texas, the epicenter of the oil boom. Ross married Virginia Louise Elkin of the well-established Midland family in 1941.