Hey @TurboSushi1 !
〜ている is used to convey that someone/something is in a constant state of ‘doing’ the verb it is attached to, and this こと is to nominalize verbs that comes before it.
For example, the sentence 想像することは大切なことです is translated as ‘Using your imagination is important.’, but a closer translation would be, ‘That which is to use your imagination, is important’.