Complex sentence: M109 has three satellite galaxies (UGC 6923, UGC 6940 and UGC 6969) and possibly might have more and detailed Hydrogen line observations have been obtained from M109 and its satellites.
Split into simpler sentences: M109 has three satellite galaxies (UGC 6923, UGC 6940 and UGC 6969) and possibly might have more. Detailed hydrogen line observations have been obtained from M109 and its satellites.