Complex sentence: In 1834 he started his own business as a watch repairer, but after two years he gave it up and obtained a position with Jones, Low & Ball and he worked there until 1839 under master watchmaker Tubal Howe.
Split into simpler sentences: In 1834 he started his own business as a watch repairer. But after two years he gave it up and obtained a position with Jones, Low & Ball and he worked there until 1839 under the master watchmaker Tubal Howe.