Complex sentence: Meanwhile, John Meredith is also having a second romance, with Rosemary West but objections from the her sister, Ellen, about a promise they made years ago, has obstructed them.
Split into simpler sentences: Meanwhile, John Meredith is also having a second romance, with Rosemary West. Objections from Rosemary's sister, Ellen, about a promise they made years ago, has obstructed them.