Complex sentence: Early synthetic sunscreens were first used in 1928, and the first major commercial product was brought to market in 1936, introduced by the founder of L'Oreal, French chemist Eugène Schueller.
Split into simpler sentences: Early synthetic sunscreens were first used in 1928. The first major commercial product was brought to market in 1936, introduced by the founder of L'Oreal, French chemist Eugène Schueller.