Complex sentence: It became the 1st Madras Europeans in 1766, the 1st Madras European Regiment in 1774 and the 1st Madras (European) Fusiliers in 1843.
Split into simpler sentences: It became the 1st Madras Europeans in 1766 and the 1st Madras European Regiment in 1774. The regiment became the 1st Madras (European) Fusiliers in 1843.