Symbiotic structural entanglement is quite a mouthful, and it might not roll off the tongue easily. Thankfully, there are many synonyms that can be used to describe this type of relationship. One term that might be used is "interdependent relationship," which highlights the way that two or more entities rely on each other for support or survival. Alternatively, you might describe this type of connection as a "mutualistic bond," emphasizing the advantages that each party receives by working together. A more poetic term might be "shared web," which conjures up an image of intricate, interconnected relationships in nature. Whatever phrase you choose, it should give readers a sense of the complex and interwoven nature of the relationship at hand.