Complex sentence: MILCs' initial purpose was to provide DSLR-like quality imaging in a small body, to obtain which they kept a DSLR-like sensor, but replaced the TTL viewfinder with an electronic one.
Split into simpler sentences: MILCs' initial purpose was to provide DSLR-like quality imaging in a small body. To obtain this, they kept a DSLR-like sensor, but replaced the TTL viewfinder with an electronic one.