Complex sentence: In the early 1820s, Louis-Raphaël Bischoffsheim founded in his own name a private banking establishment in Amsterdam, while his brother Jonathan Raphaël created a branch in Antwerp in 1827 before settling in Brussels in 1836.
Split into simpler sentences: In the early 1820s, "Louis-Raphaël Bischoffsheim" founded a private banking establishment in Amsterdam in his own name. His brother "Jonathan Raphaël" created a branch in Antwerp in 1827 before settling in Brussels in 1836.