Complex sentence: It also written into the script that Cosby's character, Cliff Huxtable, had been wrong in blaming Theo for his poor grades; this also mirrored Cosby's real life, as he had felt guilty for thinking Ennis had struggled academically because of a character flaw.
Split into simpler sentences: It also written into the script that Cosby's character, Cliff Huxtable, had been wrong in blaming Theo for his poor grades. This also mirrored Cosby's real life, as he had felt Ennis had struggled academically because of a character flaw.