Complex sentence: The term "grass" is also applied (incorrectly) to many grass-like plants not in the Poaceae including the rushes (Juncaceae) and sedges (Cyperaceae), which has leading to plants of the Poaceae often being called "true grasses".
Split into simpler sentences: The term "grass" is also applied (incorrectly) to many grass-like plants that are not members of the Poaceae lineage, including the rushes (Juncaceae) and sedges (Cyperaceae). This broad and general use of the word 'grass'has lead to plants of the Poaceae often being called "true grasses".