。
Rice is grown in many parts of the world.
Literal
Rice [topic-は] world's many regions [in-で] made is.
作られています is the passive of 作る (to make/grow) — 'is grown.' The passive frames rice as the topic without specifying who grows it. 世界の多くの地域 is 'many regions of the world.' The polite ています form makes this appropriate for educational contexts.