Complex sentence: By the mid- 19th century, the composers began to lose their patience with the showy antics of opera singers and in response, they began to write ornaments into the score rather than allowing singers to create their own embellishments.
Split into simpler sentences: By the mid- 19th century, composers began to lose their patience with the showy antics of opera singers. In response, composers began to write ornaments into the score rather than allowing singers to create their own embellishments.