Complex sentence: Bg7 (or more simply... Bf6, if the knight on f6 has moved) to exert some influence over d4, while the same bishop can also be brought via d8 to c7 to target White's kingside (in conjunction with a queen on b8).
Split into simpler sentences: Bg7 (or more simply... Bf6 if f6 is vacant) to exert some influence over d4. Or the same bishop can be brought to c7 (via d8) to target White's kingside (in conjunction with a queen on b8).