Complex sentence: Mark 15:40 and 16:1 are generally agreed to refer to the same person, see below, but traditions and authorities differ as to whether Matthew and Luke are also describing the same person, and as to exactly which person is referred to as "James".
Split into simpler sentences: Mark 15:40 and 16:1 are generally agreed to refer to the same person, see below, but traditions and authorities differ as to whether Matthew and Luke are also describing the same person. There is a similar variety of opinions as to exactly which person is referred to as "James".