complication

"The complexity of the math problems made it difficult for many students to solve them. "

"It is not necessarily true that children get their morals from their parents."

"The snowstorm made it impossible to drive to work, so I stayed home. "

"The interloper selling pirated textbooks outside the school was warned by the principal. "

"The program will run smoothly under these conditions: the computer has enough memory and the internet connection is stable. "

"The plant grew an adventitious root from its stem after it was knocked over, showing its ability to survive even in unexpected circumstances. "

""Because of unforeseen circumstances, the school trip was cancelled." "

"The heavy rain was unexpected; we had planned a picnic in the park. "

"Adding another ingredient is complicating the recipe. "

"The coexistent of the old factory and the new apartment buildings in the neighborhood shows the city's blend of history and progress. "

"My grandfather helped me with my math homework. "

"The teacher complicated the math problem by adding several extra steps. "